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DR ANTHONY MELVIN CRASTO Ph.D

DR ANTHONY MELVIN CRASTO Ph.D

DR ANTHONY MELVIN CRASTO, Born in Mumbai in 1964 and graduated from Mumbai University, Completed his Ph.D from ICT, 1991,Matunga, Mumbai, India, in Organic Chemistry, The thesis topic was Synthesis of Novel Pyrethroid Analogues, Currently he is working with GLENMARK LIFE SCIENCES LTD, Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 30 plus yrs, Prior to joining Glenmark, he has worked with major multinationals like Hoechst Marion Roussel, now Sanofi, Searle India Ltd, now RPG lifesciences, etc. He has worked with notable scientists like Dr K Nagarajan, Dr Ralph Stapel, Prof S Seshadri, Dr T.V. Radhakrishnan and Dr B. K. Kulkarni, etc, He did custom synthesis for major multinationals in his career like BASF, Novartis, Sanofi, etc., He has worked in Discovery, Natural products, Bulk drugs, Generics, Intermediates, Fine chemicals, Neutraceuticals, GMP, Scaleups, etc, he is now helping millions, has 9 million plus hits on Google on all Organic chemistry websites. His friends call him Open superstar worlddrugtracker. His New Drug Approvals, Green Chemistry International, All about drugs, Eurekamoments, Organic spectroscopy international, etc in organic chemistry are some most read blogs He has hands on experience in initiation and developing novel routes for drug molecules and implementation them on commercial scale over a 30 PLUS year tenure till date June 2021, Around 35 plus products in his career. He has good knowledge of IPM, GMP, Regulatory aspects, he has several International patents published worldwide . He has good proficiency in Technology transfer, Spectroscopy, Stereochemistry, Synthesis, Polymorphism etc., He suffered a paralytic stroke/ Acute Transverse mylitis in Dec 2007 and is 90 %Paralysed, He is bound to a wheelchair, this seems to have injected feul in him to help chemists all around the world, he is more active than before and is pushing boundaries, He has 9 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 90 Lakh plus views on dozen plus blogs, 233 countries, 7 continents, He makes himself available to all, contact him on +91 9323115463, email amcrasto@gmail.com, Twitter, @amcrasto , He lives and will die for his family, 90% paralysis cannot kill his soul., Notably he has 33 lakh plus views on New Drug Approvals Blog in 233 countries......https://newdrugapprovals.wordpress.com/ , He appreciates the help he gets from one and all, Friends, Family, Glenmark, Readers, Wellwishers, Doctors, Drug authorities, His Contacts, Physiotherapist, etc

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LYS 228


2D chemical structure of 1810051-96-7

LYS228

BOS-228
LYS-228

Molecular Formula, C16-H18-N6-O10-S2

Molecular Weight, 518.4783

(3S,4R)-3-((Z)-2-(2-Ammoniothiazol-4-yl)-2-((1-carboxycyclopropoxy)imino)acetamido)-2-oxo-4-((2-oxooxazolidin-3-yl)methyl)azetidine-1-sulfonate

RN: 1810051-96-7
UNII: 29H7N9XI1B

Unii-005B24W9YP.png

UNII-005B24W9YP

005B24W9YP

Lys-228 trihydrate

2091840-43-4

Yclopropanecarboxylic acid, 1-(((Z)-(1-(2-amino-4-thiazolyl)-2-oxo-2-(((3S,4R)-2-oxo-4-((2-oxo-3-oxazolidinyl)methyl)-1-sulfo-3-azetidinyl)amino)ethylidene)amino)oxy)-, hydrate (1:3)

1-[(Z)-[1-(2-amino-1,3-thiazol-4-yl)-2-oxo-2-[[(3S,4R)-2-oxo-4-[(2-oxo-1,3-oxazolidin-3-yl)methyl]-1-sulfoazetidin-3-yl]amino]ethylidene]amino]oxycyclopropane-1-carboxylic acid;trihydrate

BOS-228 (LYS-228) is a monobactam discovered at Novartis and currently in phase II clinical development at Boston Pharmaceuticals for the treatment of complicated urinary tract infection and complicated intraabdominal infections in adult patients.

The compound has been granted fast track and Qualified Infectious Disease Product (QIDP) designation from the FDA.

In October 2018, Novartis licensed to Boston Pharmaceuticals worldwide rights to the product.

Paper

https://pubs.acs.org/doi/10.1021/acs.oprd.9b00330

Patent

US 20150266867

PATENT

WO 2017050218

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2017050218&tab=FULLTEXT

Compound X: 1- ( ( (Z) – (1- (2-aminothiazol-4-yl) -2-oxo-2- ( ( (3S, 4R) -2-oxo-4- ( (2-oxooxazolidin-3-yl) methyl) -1-sulfoazetidin-3-yl) amino) ethylidene) amino) oxy) cyclopropanecarboxylic acid.

[0126]
Step 1: Benzhydryl 1- ( ( (Z) – (1- (2- ( (tert-butoxycarbonyl) amino) thiazol-4-yl) -2-oxo-2- ( ( (3S, 4R) -2-oxo-4- ( (2-oxooxazolidin-3-yl) methyl) azetidin-3-yl) amino) ethylidene) amino) oxy) cyclopropanecarboxylate. To a solution of (Z) -2- ( (1- ( (benzhydryloxy) carbonyl) cyclopropoxy) imino) -2- (2- ( (tert-butoxycarbonyl) amino) thiazol-4-yl) acetic acid (854 mg, 1.59 mmol) prepared according to published patent application US2011/0190254, Intermediate B (324 mg, 1.75 mmol) and HATU (785 mg, 2.07 mmol) in DMF (7.9 mL) , DIPEA was added (832 μL, 4.77 mmol) . After 1 h of stirring, it was poured into water and extracted with EtOAc. Brine was added to the aqueous layer, and it was further extracted with ethyl acetate (EtOAc) (3x) . The combined organic layers were dried over Na 2SO 4 and concentrated in vacuo. The crude residue was purified via silica gel chromatography (0-10%MeOH-DCM) to afford the title compound (1.09 g, 97%) as a beige foam. LCMS: R t = 0.97 min, m/z =705.3 (M+1) Method 2m_acidic.

[0127]
Instead of HATU, a variety of other coupling reagents can be used, such as any of the typical carbodiimides, or CDMT (2-chloro-4, 6-dimethoxy-1, 3, 5-triazine) and N-methylmorpholine to form the amide bond generated in Step 1.

[0128]
Step 2: (3S, 4R) -3- ( (Z) -2- ( (1- ( (benzhydryloxy) carbonyl) cyclopropoxy) imino) -2- (2- ( (tert-butoxycarbonyl) amino) thiazol-4-yl) acetamido) -2-oxo-4- ( (2-oxooxazolidin-3-yl) methyl) azetidine-1-sulfonic acid. Benzhydryl 1- ( ( (Z) – (1- (2- ( (tert-butoxycarbonyl) amino) thiazol-4-yl) -2-oxo-2- ( ( (3S, 4R) -2-oxo-4- ( (2-oxooxazolidin-3-yl) methyl) azetidin-3-yl) amino) ethylidene) amino) oxy) cyclopropanecarboxylate (1.00 g, 1.42 mmol) in DMF (7.0 mL) at 0 ℃ was treated with SO 3·DMF (448 mg, 2.84 mmol) . After 2 h of stirring at rt, the solution was poured into ice-cold brine and extracted with EtOAc (3x) . The combined organic layers were dried over Na 2SO 4 and concentrated in vacuo, affording the title compound (assumed quantitative) as a white solid. LCMS: Rt =0.90 min, m/z = 785.2 (M+1) Method 2m_acidic.

[0129]
Step 3: 1- ( ( (Z) – (1- (2-aminothiazol-4-yl) -2-oxo-2- ( ( (3S, 4R) -2-oxo-4- ( (2-oxooxazolidin-3-yl) methyl) -1-sulfoazetidin-3-yl) amino) ethylidene) amino) oxy) cyclopropanecarboxylic acid.

[0130]

[0131]
To a solution of (3S, 4R) -3- ( (Z) -2- ( (1- ( (benzhydryloxy) carbonyl) cyclopropoxy) imino) -2- (2- ( (tert-butoxycarbonyl) amino) thiazol-4-yl) acetamido) -2-oxo-4- ( (2-oxooxazolidin-3-yl) methyl) azetidine-1-sulfonic acid (1.10 g, 1.40 mmol) in DCM (1.5 mL) at 0℃, TFA (5.39 mL, 70.0 mmol) was added, and after 10 minutes, the ice bath was removed. Additional TFA (3.24 mL, 42.0 mmol) was added after 1 hr at rt and the solution was diluted with DCM and concentrated in vacuo after an additional 30 min. Optionally, anisole may be added to the TFA reaction to help reduce by-product formation, which may increase the yield of desired product in this step. The crude residue was purified by reverse phase prep HPLC (XSelect CSH, 30 x 100 mm, 5 μm, C18 column; ACN-water with 0.1%formic acid modifier, 60 mL/min) , affording the title compound (178 mg, 23%) as a white powder. LCMS: R t = 0.30 min, m/z = 518.9 (M+1) Method 2m_acidic; 1H NMR (400 MHz, DMSO-d 6) δ 9.27 (d, J = 9.0 Hz, 1H) 6.92 (s, 1H) 5.23 (dd, J = 9.1, 5.7 Hz, 1H) 4.12-4.23 (m, 3H) 3.72-3.62 (m, 2H assumed; obscured by water) 3.61-3.52 (m, 1H assumed; obscured by water) 3.26 (dd, J = 14.5, 5.9 Hz, 1H) 1.36 (s, 4H) . 1H NMR (400 MHz, D 2O) δ 7.23 (s, 1H) , 5.48 (d, J = 5.8 Hz, 1H) , 4.71-4.65 (m, 1H) , 4.44 (t, J = 8.2 Hz, 2H) , 3.89-3.73 (m, 3H) , 3.54 (dd, J = 14.9, 4.9 Hz, 1H) , 1.65-1.56 (m, 2H) , 1.56-1.46 (m, 2H) . The product of this process is amorphous. Compound X can be crystallized from acetone, ethanol, citrate buffer at pH 3 (50 mM) , or acetate buffer at pH 4.5 (50 mM) , in addition to solvents discussed below.

PAPER

Bioorganic & Medicinal Chemistry Letters (2018), 28(4), 748-755.

https://www.sciencedirect.com/science/article/pii/S0960894X18300064

PATENT

WO 2019026004

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2019026004&tab=PCTDESCRIPTION

Over the past several decades, the frequency of antimicrobial resistance and its association with serious infectious diseases have increased at alarming rates. The increasing prevalence of resistance among nosocomial pathogens is particularly disconcerting. Of the over 2 million (hospital-acquired) infections occurring each year in the United States, 50 to 60% are caused by antimicrobial-resistant strains of bacteria. The high rate of resistance to commonly used antibacterial agents increases the morbidity, mortality, and costs associated with nosocomial infections. In the United States, nosocomial infections are thought to contribute to or cause more than 77,000 deaths per year and cost approximately $5 to $10 billion annually.

Important causes of Gram-negative resistance include extended-spectrum 13- lactamases (ESBLs), serine carbapenemases (KPCs) and metallo-13-lactamases (for example NDM-1 ) in Klebsiella pneumoniae, Escherichia coli, and Proteus mirabilis, high-level third-generation cephalosporin (AmpC) 13-lactamase resistance among Enterobacter species and Citrobacter freundii, and multidrug-resistance genes observed in Pseudomonas, Acinetobacter, and Stenotrophomonas. The problem of antibacterial resistance is compounded by the existence of bacterial strains resistant to multiple antibacterials. For example, Klebsiella pneumonia harboring NDM-1 metallo-13- lactamase carries frequently additional serine-13-lactamases on the same plasmid that carries the NDM-1 .

Thus there is a need for new antibacterials, particularly antibacterial compounds that are effective against existing drug-resistant microbes, or are less susceptible to development of new bacterial resistance. Monobactam antibiotic, which is referred to herein as Compound X, is primarily effective against Gram-negative bacteria, including strains that show resistance to other monobactams.

The present invention relates to a process for the preparation of monobactam antibiotic Compound X and intermediates thereof.

More particularly, the present invention relates to a process for the preparation of Compound X

Compound X

also referred to as 1 -(((Z)-(1 -(2-aminothiazol-4-yl)-2-oxo-2-(((3S,4R)-2-oxo-4-((2-oxooxazolidin-3-yl)methyl)-1 -sulfoazetidin-3-yl)amino)ethylidene)amino)oxy)cyclopropanecarboxylic acid, or a salt thereof, or a solvate including hydrate thereof.

Patent application number PCT/US2015/02201 1 describes certain monobactam antibiotics. Compound X may be prepared using the method disclosed in PCT/US2015/02201 1 , in particular example 22, and in PCT/CN2016/099482.

A drawback from these processes is that they exhibit a large number of process steps and intermediate nitrogen protection/deprotection steps, reducing the overall yield and efficiency. Furthermore, these processes require several chromatographic purification steps to be carried out in course of the processes. We have found that the preparation of Compound X, as previously prepared on a manufacturing scale, possesses a number of disadvantages, in particular poor handling characteristics.

It would thus be beneficial to develop alternative or improved processes for the production of Compound X that do not suffer from some or all of these disadvantages.

Compound x Compound x

Scheme 1

Preparation of Compound X from Intermediates 22 and 2A

Scheme 3

Examples

The Following examples are merely illustrative of the present disclosure and they should not be considered as limiting the scope of the disclosure in any way, as these examples and other equivalents thereof will become apparent to those skilled in the art in the light of the present disclosure, and the accompanying claims.

Synthesis of Compound 8 (R = benzyl)

1 .50kg oxazolidin-2-one (7b) was charged into the reactor. 7.50kg THF was charged and the stirring started. The mixture was cooled to 10~20°C. 2.18kg potassium fert-butoxide was charged intol 2.00kg THF and stirred to dissolve.

The potassium fert-butoxide solution was added dropwise into the reactor while maintaining the temperature at 10-20 °C. The reaction was stirred for 1 ~2hrs at 10-20 °C after the addition. The solution of 2.36kg methyl-2-chloroacetate (7a) in 3.00kg of THF was added to the reactor while maintaining the temperature at 10-20 °C. The reaction mixture was stirred for 16-18 h at 20-25 °C. The IPC (in process control) showed completion of the reaction. The mixture was centrifuged and the wet cake was washed with 7.50kg THF. The filtrate was concentrated and the crude 7 was provided as reddish brown liquid, which was used for the next step without further purification,

1H NMR (400 MHz, CHLOROFORM- /) δ ppm 3.65 – 3.71 (m, 2 H) 3.74 (s, 3 H) 4.02 (s, 2 H) 4.34 – 4.45 (m, 2 H).

The dried reactor was exchanged with N2 three times. 3.71 kg LiHMDS solution in THF/Hep (1 M) and 1 .30kg THF were charged under nitrogen protection. The stirring was started and the solution was cooled to -70—60 °C. The solution of 0.71 kg benzyl acetate (6) in 5.20 kg THF was added dropwisely at -70— 60 °C, and the resulted mixture was stirred for 1 -1 .5 h after the addition. The solution of 0.65kg 7 in 3.90kg THF was added dropwise while maintaining the temperature at -70—60 °C, then stirred for 30-40 minutes. The reaction mixture was warmed to 20-25 °C and stirring was continued for 0.5-1 .0 h. IPC showed 6 was less than1 .0% (Otherwise, continue the reaction till IPC passes). The reaction mixture was poured into 13.65 kg aqueous citric acid below 10 °C. The mixture was stirred for 15-20 minutes after the addition. Phases were separated and the organic layer was collected. The aqueous layer was extracted with EA (6.50kg * 2). The organic layer was combined, washed by 6.50 kg 28% NaCI solution and dried with 0.65

kg anhydrous MgSC . The mixture was filtered and the wet cake was washed with 1 .30kg EA. The filtrate was concentrated under vacuum to provide crude 8. The crude 8 was stirred in 2.60 kg MTBE at 20-25 °C for 1 -1 .5 h. The mixture was cooled to 0-10 °C and stirred for 1 .5-2.0 h and filtered. The filter cake was washed with 0.65kg pre-cooled MTBE and dried under vacuum (<-0.096Mpa) at 20-25 °C for 12~16hrs till a constant weight to give 513 g of 8 as a white solid, Yield: 45%, HPLC purity 96.4%,1 H NMR (400 MHz, CHLOROFORM-c δ ppm 3.48 – 3.55 (m, 1 H) 3.56 – 3.63 (m, 2 H) 3.66 – 3.74 (m, 1 H) 4.17 – 4.26 (m, 2 H) 4.31 – 4.44 (m, 2H) 5.12 – 5.24 (m, 2 H) 7.30 – 7.44 (m, 5 H).

Synthesis of Compound 9 (R = benzyl)

The dried reactor was charged with 3.75kg HOAc and 1 .50 kg 8. The stirring was started and the reaction mixture was cooled to 0-5 °C. 3.53kg aqueous NaN02 was added dropwise at 0-10 °C, and the reaction mixture was stirred for 15-30 minutes after the addition. IPC showed 8 was less than 0.2%. The reaction mixture was treated with 7.50kg EA and 7.50 kg water. Phases were separated and the organic layer was collected. The aqueous layer was extracted with EA (7.50kg * 2). The organic layers were combined, washed with 7.50 kg 28% NaCI solution, and concentrated under vacuum to provide crude 9. The crude 9 was slurried with 5.25 kg water at 10-20 °C for 3~4hrs, and filtered. The wet cake was washed with 1 .50kg water. The solid was dried under vacuum (<-0.096 Mpa) at 45-50 °C for 5-6 h till a constant weight to give 1 .44 Kg of 9, yield: 86.9%, HPLC purity 92.9%,1H NMR (400 MHz, CHLOROFORM- /) δ ppm 3.60 – 3.76 (m, 2 H) 4.44 (t, J=8.07 Hz, 2 H) 4.60 (s, 2 H) 5.25 – 5.41 (m, 2 H) 7.30 – 7.43 (m, 5 H) 1 1 .62 (br s, 1 H).

Synthesis of Compound 9a (R = benzyl)

9

The dried reactor was charged with 0.58 kg Zn, 4.72kg (Βο Ο, 6.00 kg water, 1 .20 kg NH4CI and 6.00kg THF. The reaction mixture was stirred and heated to 50-55 °C. The solution of 0.60 kg 9 in 4.20kg THF

was added dropwisely while maintaining the temperature at 50-55 °C. The reaction mixture was stirred for 0.5-1 .Ohrs after the addition. IPC showed 9 was less than 0.1 %. The reaction mixture was treated withl .50 kg ethyl acetate and stirred for 15-20 minutes. Phase was separated and the water layer was extracted by1 .50 kg ethyl acetate. The organic layers were combined, washed with 6.00 kg 28% NaCI solution and concentrated under vacuum to provide crude 9a. The crude 9a was stirred with 3.60kg*2 n-heptane to remove excess (Βο Ο. The residue was purified by silica gel chromatography column eluted with ethyl acetate: Heptane= 1 :1 to provide crude 9a solution. The solution was concentrated under reduced pressure to obtain crude 9a. The crude 9a was slurried with 1 .80 kg MTBE for 2.0-3. Ohrs, filtered, and the wet cake was washed with MTBE. The solid was dried under vacuum (<-0.096 Mpa) at 50-55 °C for 16-18 h till a constant weight to give 392 g of 9a as a white solid, Yield: 51 %, HPLC purity 98.1 %,1H NMR (400 MHz, DMSO-cfe) δ ppm 1.17 – 1 .57 (m, 9 H) 3.39 – 3.61 (m, 2 H) 4.20 – 4.45 (m, 3 H) 5.10 – 5.32 (m, 3 H) 5.75 (s, 1 H) 7.38 (br s, 5 H) 7.75 – 7.99 (m, 1 H).

Synthesis of compound (VII) (R = benzyl, X = CI)

9a VII

The dried reactor was charged with 13.0kg HCI in IPA and the stirring was started. 1 .33 kg 9a was charged in portions at 20-25 °C. The mixture was stirred at 20-25 °C for 3-4 h. IPC showed 9a was less than 0.1 %. The reaction solution was concentrated under vacuum 40-45 °C. The residue was treated with 21 .58kg MTBE at 20-25 °C for 3-4 h. The mixture was filtered and the wet cake was washed with 2.60kg MTBE. The solid was dried under vacuum (<-0.096 Mpa) at 45-50 °C for 5-6 h till a constant weight to give 1 .045 Kg of compound VII (R = benzyl, X = CI) as a yellow solid, Yield: 93.7%, HPLC purity 99.2%,1 H NMR (400 MHz, DMSO-cfe) δ ppm 3.16 – 3.74 (m, 3 H) 4.10 – 4.35 (m, 4 H) 5.09 – 5.39 (m, 2 H) 7.27 – 7.60 (m, 5 H) 8.72 (br s, 2 H).

Synthesis of compound (Vile) (R = benzyl)

VII Vile

To an autoclave (3L) were added VII (R = benzyl, X = CI) (100 g, 304.2 mmol, 1 .0 equiv.), DCM (2650 g, 26.5 equiv., w/w) and (S-BINAP)RuCl2 (2.4 g, 3.04 mmol, 0.01 equiv.), successively. Air in the autoclave was replaced with N2 5 times. N2 in the autoclave was was replaced with H2 5 times. The solution was stirred with 250-260 r/min and H2 (2.1 ±0.1 MPa) at 40±5°C for 24 h. The reaction mixture was filtered, and the filter cake was washed with DCM (400 g, 4.0 equiv., w/w). The filter cake was slurried with IPA (785 g, 7.85 equiv., w/w) and H2O (40 g, 0.4 equiv., w/w) overnight (18-20 h). The mixture was filtered. The filter cake was washed with IPA (200 g, 2.0 equiv., w/w) and dried at 45±5°C overnight (18-20 h). Vile (R = benzyl) was obtained as off-white solid, 80.4 g, 79.9% yield, 95.5% purity, 97.6% de, >99.5% ee. 1H NMR (400 MHz, DMSO-cfe) δ ppm 3.34-3.38 (m, 2 H) 3.50-3.52 (m, 1 H) 3.60-3.62 (m, 1 H) 4.18-4.24 (m, 4 H) 5.23 (s, 2H) 6.16 (s, 1 H) 7.32 (m, 5H) 8.74 (s, 1 H).

Alternative synthesis of compound 9a (R = benzyl)

5b

Mg(OtBu)2

To a flask was added 5a (1 .88 g, 12.93 mmol), THF (40 mL), and CDI (2.20 g, 13.58 mmol) at 25 °C. The mixture was stirred for 3 h. To the reaction mixture was added 5b (2.00 g, 6.47 mmol), and Mg(OfBu)2 (2.21 g, 12.93 mmol). The reaction mixture was stirred at 25 °C for 24 h. The reaction mixture was concentrated under vacuum to remove most of the THF solvent. To the concentrated solution was added MTBE (40 mL), followed by addition of an aqueous solution of HCI (1 M, 60mL) to adjust to pH = 2-3. Two phases were separated, and the water phase was extracted with MTBE (20 mL). The combined organic phase was washed with aqueous NaHCC (5%, 50 mL) and brine (20%, 40 mL). The organic phase was concentrated to a weight of -19 g, and a lot of white solid was obtained in the concentration process. The suspension was cooled to 0 °C, and filtered. The filter cake was washed with cold MTBE (5 mL) and dried under vacuum to obtain product 9a (1 .6g, 63% yield).

Synthesis of compound (Vile) (R = benzyl, PG = Cbz)

Vile Vile

To a flask (5 L) were added Vile (R = benzyl) (140 g, 423.2 mmol, LOequiv.), H20 (1273 g, 9.09 equiv., w/w) and toluene (2206 g, 15.76 equiv., w/w). The solution was stirred and cooled to 0-5 °C with ice bath. Then NaHCOa (78.4 g, 933 mmol, 2.22 equiv.) was added and CbzCI (89.6 g, 527 mmol, 1 .24 equiv.) was dropped into the stirring solution, respectively. The solution was stirred at 30±5 °C overnight (18-20 h). Heptane (3612 g, 25.8 equiv., w/w) was added dropwise to the stirring solution over 1 h at 20-30 °C. The mixture was filtered. The filter cake was washed with heptane (280 g, 2.00 equiv., w/w) and MTBE (377 g, 2.69 equiv., w/w), respectively. The filter cake was dried at 45±5°C overnight (18-20 h). Vile (R = benzyl, PG = Cbz) was obtained as an off-white solid, 169.4 g, 93% yield, 96.7% purity, 98% de, >99.5% ee, 1 H NMR (400 MHz, DMSO-cfe) δ ppm 3.23-3.24 (m, 1 H) 3.30 (m, 1 H) 3.51 -3.55 (m, 2 H) 3.99 (s, 1 H) 4.17-4.21 (m, 3 H) 5.02-5.03 (m, 2H) 5.12 (s, 2H) 5.46-5.48 (d, 1 H) 7.33-7.36 (m, 10H) 7.75-7.73 (d, 1 H).

Synthesis of compound (IV) (PG = Cbz)

Vile IV

Vile (R = benzyl) (220 g, 513.5 mmol, 1 .0 equiv.) was dissolved in THF (1464g, 6.65 equiv., w/w). The solution was filtered. The filter cake was washed with THF (488g, 2.22 equiv., w/w). The filtrate (Vile) was collected. To an autoclave (3L) were added the filtrate (Vile). The reactor was cooled down to -75 – -65 °C with dry-ice/EtOH bath, and bubbled with NH3 for not less than 4 h. Then the solution was stirred at 25±5 °C with NH3 (0.5-0.6 MPa) for 24 h. The autoclave was deflated to release NH3. The reaction solution was concentrated with a rotary evaporator to remove THF until the residue was around 440 g. The residue was slurried with EA (2200 g, 10 equiv., w/w) at 70±2 °C, then cooled to 25±5 °C and stirred for 16-18 h. The mixture was filtered. The filter cake was washed with EA (440 g). The filter cake was slurried with EA (1320 g, 6.00 equiv. w/w), and the temperature was raised to 70±2 °C, then cooled to 25±5 °C and stirred for 16-20 h. The mixture was filtered. The filter cake was washed with EA, and dried at 50±5 °C overnight (18-20 h). IV (PG = Cbz) was obtained as off-white solid, 141 g, 81 .5% yield, 99.1 % purity, >99.5% assay, 1H NMR (400 MHz, DMSO-cfe) δ ppm 3.12 – 3.23 (m, 2 H) 3.31 (br s, 1 H) 3.56 (t, J=8.01 Hz, 2 H) 3.88 (quin, J=6.02 Hz, 1 H) 3.93 – 4.03 (m, 1 H) 4.20 (t, J=8.01 Hz, 2 H) 5.02 (s, 2 H) 5.27 (d, J=5.87 Hz, 1 H) 7.12 (s, 1 H) 7.22 – 7.45 (m, 5 H).

Synthesis of compound (III) (PG = Cbz, LG = S02CH3)

IV III

To a flask was added IV (PG = Cbz) (14.00 g, 41 .50 mmol, 1 .00 equiv), and dry 1 , 2-dimethoxyethane (300 mL) under N2. The mixture was stirred at -5°C ~ 0°C for 1 h to obtain a good suspension. MsCI (7.89 g, 68.89 mmol, 5.33 mL, 1 .66 eq) in 1 , 2-dimethoxyethane (20.00 mL) was added dropwise during 30 min, and Et3N (12.60 g, 124.50 mmol, 17.26 mL, 3.00 eq) in 1 , 2-dimethoxyethane (20.00 mL) was added dropwise during 30 min side to side. The reaction mixture was stirred for additional 5 min at -5°C ~ 0°C, and was quenched with water (6 mL). The reaction mixture was concentrated to remove DME. The solid was slurried in water (250 mL) and MTBE (125 mL) for 1 h. The solid was collected by filtration, and then slurried in water (250 mL) for 1 hr. The solid was collected by filtration, and washed with water (25 mL) to give white solid. The solid was slurried in EA (150 mL) and dried in vacuum at 60°C for 24 h to give III (PG = Cbz, LG = SO2CH3) (15.00 g, 36.1 1 mmol, 87.01 % yield), 1H NMR (400 MHz, DMSO-cfe) δ ppm 3.17 (s, 3 H) 3.26 (br d, J=15.04 Hz, 1 H) 3.47 – 3.57 (m, 1 H) 3.64 (br d, J=6.36 Hz, 2 H) 4.22 (br dd, J=17.79, 8.50 Hz, 2 H) 4.50 (br s, 1 H) 4.95 – 5.17 (m, 3 H) 7.21 – 7.56 (m, 5H) 7.43 (s, 1 H) 7.63 – 7.89 (m, 2 H).

Synthesis of compound II (PG = Cbz, LG = SO2CH3, M+ = NBu4+)

O OMs o CISO3H, 2-picoline – ° O ?yO

HN Bu4NHS04< NHCbz

“Cbz

III II

To a flask was added 2-picoline (1 1 .50 g, 12.23 mL) and DMF (10 mL). The solution was cooled to 5 SC, followed by slow addition of chlorosulfonic acid (7.20 g, 4.14 mL). The temperature was increased to 20 SC. Ill (PG = Cbz, LG = SO2CH3) (5.13 g, 12.35 mmol) was added to the reaction mixture. The reaction mixture was heated to 42 SC for 18h. IPC (in process control) showed complete conversion of starting material. The reaction was cooled to 20 SC and dropwise added to a solution of tetrabutylammonium hydrogen sulfate (4.6 g, 13.6 mmol) in the mixed solvents of dichloromethane (100 mL) and water (100 mL) at 5SC. The phases were separated and the water phase was extracted with dichloromethane (2*50mL). The combined organic phase was washed with water (5*100mL). The organic phase was concentrated to dryness and purified by column chromatography (dichloromethane/methanol = 15/1 v/v) to afford II (PG = Cbz, LG = SO2CH3, M+ = NBii4+) (8.4 g, 92.30%), 1 H NMR (400 MHz, CHLOROFORM-c/) δ ppm 0.99 (t, J=7.34 Hz, 12 H) 1 .36 – 1 .50 (m, 8 H) 1 .54 – 1 .76 (m, 8 H) 3.15 (br d, J=8.31 Hz, 2 H) 3.21 – 3.35 (m, 8 H) 3.47 (br dd, J=14.73, 7.27 Hz, 1 H) 3.54 – 3.65 (m, 1 H) 3.67 – 3.81 (m, 2 H) 4.17 – 4.32 (m, 1 H) 4.39 – 4.62 (m, 1 H) 4.74 (br s, 1 H) 5.1 1 (s, 3 H) 5.32 – 5.50 (m, 1 H) 6.47 (br s, 1 H) 7.29 – 7.47 (m, 5 H) 8.69 – 8.94 (m, 1 H).

Synthesis of compound (IA)

A solution of II (PG = Cbz, LG = SO2CH3, M+ = NBu4+) (4.0 g) in dichloromethane (38 mL) was pumped to tube A at rate of 2.0844 mL/min, and a solution of KHCO3 (3.0 g) in water (100 mL) was pumped to tube B at a rate of 1 .4156 mL/min side to side. These two streams were mixed in a cross-mixer then flowed to a tube coil that was placed in an oil bath at 100 °C. The residence time of the mixed stream in the coil was 2 min. The reaction mixture flowed through a back-pressure regulator that was set at ~ 7 bars, and was collected to a beaker. After completion of the collection, two phases was separated. The organic phase was concentrated to dryness. The residue was slurried in ethyl acetate (5 mL). The solid was filtered and the filter cake was dried to give IA (2.6 g, 75%),

1H NMR (400 MHz, CHLOROFORM-c/) δ ppm 1.00 (t, J=7.27 Hz, 12 H) 1 .42 (sxt, J=7.31 Hz, 8 H) 1 .62 (quin, J=7.83 Hz, 8 H) 3.13 – 3.39 (m, 8 H) 3.54 – 3.69 (m, 2 H) 3.81 (dd, J=14.98, 2.51 Hz, 1 H) 3.96 – 4.13 (m, 1 H) 4.22 – 4.47 (m, 3 H) 4.99 – 5.23 (m, 3 H) 6.42 (br d, J=9.29 Hz, 1 H) 7.26 – 7.44 (m, 5 H).

Synthesis of compound 2A

Step 1

To a stirring solution of compound 16b (2 g, 10.14mmol, 1 .0 eq) in DMF (20 ml_) was added CS2CO3 (5.29g, 16.22 mmol, 1 .6 eq), then the resulting solution was stirred at room temperature for 10mins, then compound 16a (5.27g, 20.28mmol, 2eq) was added dropwise to the mixture for 2 minutes, then the resulting solution was stirred for another 2 hours. TLC showed the starting material was consumed completely. The mixture was added with water (60mL) and extracted with MTBE (20mL*3). The combined organic layers were dried over anhydrous sodium sulfate and concentrated. The crude was slurried in heptane to give 1 .65 g 16 as a white solid (Yield: 57%), 1H NMR (400 MHz, DMSO-cfe) δ ppm 7.48-7.28 (m, 10 H), 5.00-4.96 (t, J=6.0 Hz, 1 H), 3.81 (s, 3H), 3.44-3.42 (m, 2H), 2.40-2.37 (m, 2H).

Compound 16 (1 g, 2.66mmol, 1 eq) was dissolved in THF (20mL) under Nitrogen, and cooled to -40 °C. NaHMDS (1 .6mL, 2.0M THF solution, 1 .2 eq) was added dropwise. The reaction was stirred for 1 h at -40 °C. HPLC indicated the reaction was finished. The reaction was quenched with 10% Citric acid, extracted with MTBE (25 ml_ x 2). The combined organic layers were washed with brine (30 ml_), dried with Na2S04, filtered and concentrated to give 17 as a yellow solid, which was used for the next step without purification (assay yield: 65%); 1H NMR (400 MHz, DMSO-cfe) δ ppm 7.27-7.13 (m, 10 H), 3.46 (s, 3H), 1 .21 -1 .17(dd, J=7.2, 10.4 Hz, 2H ); 1 .14-1 .1 1 (dd, J=7.2, 10.4 Hz, 2H).

Step 3

Compound 17 (100 mg) was dissolved in methanol (5 mL) and 2.0 M HCI IPAC solution (5 mL). The solution was heated at 45 °C for 3 days. HPLC indicated the reaction was finished. The reaction was cooled to room temperature and was diluted with 10 mL water. The reaction mixture was washed with MTBE (10 mL x 2), organic layer was discarded and the aqueous layer was concentrated to give compound 2A HCI (32 mg, 62% yield), 1 H NMR (400 MHz, DMSO-cfe) δ ppm 3.80-3.44 (br, 4H), 1 .56 (s, 2H), 1 .38 (s, 2H).

Step 4

To a solution of 2A HCI (0.70 g, 4.57 mmol) in methanol (5 mL) was added triethylamine (1 .26 mL, 9.14 mmol) at room temperature. The solution was stirred for 20 min, and the solvent was removed under vacuum. To the residue was added IPAC (10 mL) leading to precipitation. The solid was filtered, and the filtrate was concentrated to provide 2A (0.50g, 94% yield) containing ca. 6 wt% Et3N-HCI.

Synthesis of Compound X from compound of formula (I), (IA)

Compound x

To a flask was charged 21 (1 .00 g, 68.43 wt%, 2.50 mmol) and DMF (10 mL). The suspension was cooled to -20 °C, to which was added diphenylphosphinic chloride (0.52 mL, 2.75 mmol). The solution was stirred at -20 °C for 30 min, followed by addition of a mixed solution of (IA) (1 .52g, 3.00 mmol) and triethylamine (0.52 mL, 3.76 mmol) in DMF (2mL). The reaction mixture was stirred at 20 °C for 20 h, followed by addition of MTBE (20 mL). The reaction mixture was adjusted to pH = 2-3 using aqueous HCI solution (37%). To the mixture was added isopropanol (100 mL). The resulting mixture was stirred for 4 h to obtain a suspension. The suspension was filtered and the filter cake was dried under vacuum to afford crude 22 (1 .17 g). The crude 22 was slurried in a combined solvent of THF/H2O (= 12 mL / 3mL), and filtered to afford 22 (0.744 g, 75 wt% by Q-NMR, 53.3% yield). 1H NMR (400 MHz, DMSO-cfe) δ ppm 3.47 – 3.55 (m, 2 H) 3.59 – 3.63 (m, 2 H) 4.13 – 4.21 (m, 3 H ) 5.05 (dd, J=8.8, 5.6 Hz, 1 H) 8.22 (s, 1 H) 9.73 (d, J=8.7 Hz, 1 H).

To a suspension of 22 (580 mg, 75 wt%, 1 .037 mmol) in DMAC (1 .5 mL) was added 2A (214.3 mg, 85 wt%, 1 .556 mmol). The reaction was stirred at 25 °C for 3 days, and in process control showed 22, Compound X = 4/96, and Z/E = 91 /9. the mixture was slowly added into 15ml acetone to precipitate yellowish solid. The reaction mixture was filtered to afford Compound X (0.7 g, 34 wt% by QNMR, 44% yield).

Synthesis of compound 3 (R2 = CH(Ph)2)

R2 = CH(Ph)2

2-(2-aminothiazol-4-yl)-2-oxoacetic acid (Y) (10.00 g, 47.93 mmol) and compound W (R2 = CH(Ph)2) (13.31 g, 46.98 mmol) were suspended in DMAC (40 mL), followed by addition of triethylamine (5.01 mL, 35.95 mmol). The reaction mixture was stirred at 20 °C for 5 h. HPLC showed completion of the reaction, and Z/E

= 97/3. To the reaction mixture was added water (120 mL) with stirring. The mixture was stirred for 20 min to obtain a suspension. The suspension was filtered and the filter cake was washed with water (50 mL).

The filter cake was slurried in a combined solvent of THF/ethyl acetate (50 mL / 50 mL) at 60 °C and cooled to 20 °C. The solid was filtered and dried at 50 °C for 3 h to get 3 (R2 = CH(Ph)2) (19.5 g, 88% yield). 1H

NMR (400 MHz, DMSO-cfe) δ ppm 1.37 -1 .42 (m, 2 H) 1 .44 – 1 .49 (m, 2 H) 6.87 (s, 1 H) 6.94 (s, 1 H) 7.22

– 7.30 (m, 6 H) 7.45 – 7.49 (m, 4 H).

Alternative Synthesis of Compound X from compound of formula (I), (IA)

Compound x

IA (40.14 g, 62.63 mmol) was dissolved in methanol (200 ml_), followed by addition of Pd/C (10%, 1 .1 g). The reaction mixture was maintained under hydrogen atmosphere (1 -2 bar) at 20 °C for 24 h. In process control showed completion of the reaction. The reaction mixture was filtered. The filtrate was concentrated to give an oil of IB (M+ = NBu4+) (58.20 g, 55 wt% by Q-NMR, 100% yield). 1 H NMR (400 MHz, DMSO-cfe) δ ppm 0.93 (t, J=7.3 Hz, 12 H) 1 .23 – 1 .36 (m, 8 H) 1 .57 (m, 8 H) 2.99 – 3.28 (m, 8 H) 3.37 (dd, J=14.3, 7.5 Hz, 1 H) 3.65 – 3.70 (m, 3 H) 3.84 – 3.88 (m, 1 H) 4.08 (d, J=5.6 Hz, 1 H) 4.18 – 4.22 (m, 2 H).

3 (R2 = CH(Ph)2) (0.95 g, 2.17 mmol) was dissolved in THF (20 ml_). To the solution was added /V-methyl morpholine (0.77 g, 7.60 mmol) and 2-chloro-4,6-dimethoxy-1 ,3,5-triazine (0.57 g, 3.26 mmol). The reaction mixture was stirred at 20 °C for 1 h followed by addition of IB (M+ = NBu +) (2.70 g, 48.98 wt%, 2.61 mmol). The reaction was stirred at 20 °C for 5 h. In process control showed completion of the reaction. To the reaction mixture was added ethyl acetate (20 ml_). The organic phase was washed with brine (10 ml_). Solvent was removed. Acetone (40ml) was added to dissolve residue. TFA (1 .24 g, 10.86 mmol) dissolved in acetone (3 ml) was added slowly. The white solid was filtered and washed by acetone (10 ml) two times. Dried at 40 °C for 5h to get compound 4 (R2 = CH(Ph)2). 1 H NMR (400 MHz, DMSO-cfe) δ ppm 1 .49 – 1 .55 (m, 4 H) 3.27 (dd, J=14.4, 6.2 Hz, 1 H) 3.49 – 3.65 (m, 2 H) 3.71 (dd, J=14.4, 6.2 Hz, 1 H) 4.04 – 4.10 (m, 1 H) 4.07 (dd, J=16.0, 8.6 Hz, 1 H) 4.17 (dd, J=1 1 .8, 6.0 Hz, 1 H) 5.28 (dd, J=9.0, 5.7 Hz, 1 H) 6.88 (s, 1 H) 7.03 (s, 1 H) 7.18 – 7.32 (m, 6 H) 7.43 (m, 4 H) 9.45 (d, J=9.0 Hz, 1 H).

Crude 4 (R2 = CH(Ph)2) (2.13 g) was dissolved in dichloromethane (20 ml_). The solution was cooled to 0 °C. To the solution was added anisole (0.68 ml_, 6.24 mmol) and trifluoroacetic acid (2.16 ml_, 28.08 mmol). The reaction was warmed to 20 °C, and stirred for 15 h. In process control showed completion of the

reaction. The aqueous phase was separated and added to acetone (40 mL) to obtain a suspension. The suspension was filtered to afford Compound X (0.98 g, 54.5% yield over two steps). 1 H NMR (400 MHz, DMSO-c/e) δ ppm 1.40 (m, 4 H) 3.26 (dd, J=14.4, 6.0 Hz, 1 H) 3.54 – 3.69 (m, 3 H) 4.14 – 4.21 (m, 3 H) 5.25 (dd, J= 8.9, 5.7 Hz, 1 H) 7.02 (s, 1 H) 9.38 (d, J=9.0 Hz, 1 H).

REF

Synthesis and optimization of novel monobactams with activity against carbapenem-resistant Enterobacteriaceae – Identification of LYS228
57th Intersci Conf Antimicrob Agents Chemother (ICAAC) (June 1-5, New Orleans) 2017, Abst SATURDAY-297

//////////////LYS228, LYS 228, BOS-228, LYS-228, monobactam, Novartis, phase II,  Boston Pharmaceuticals, complicated urinary tract infection, complicated intraabdominal infections,  fast track, Qualified Infectious Disease Product, QIDP,

Nc1nc(cs1)\C(=N\OC2(CC2)C(=O)O)\C(=O)N[C@H]3[C@@H](CN4CCOC4=O)N(C3=O)S(=O)(=O)O

Pfizer’s Monobactam PF-?


STR1

Pfizer’s monobactam PF-?

1380110-34-8, C20 H24 N8 O12 S2, 632.58

Propanoic acid, 2-​[[(Z)​-​[1-​(2-​amino-​4-​thiazolyl)​-​2-​[[(2R,​3S)​-​2-​[[[[[(1,​4-​dihydro-​1,​5-​dihydroxy-​4-​oxo-​2-​pyridinyl)​methyl]​amino]​carbonyl]​amino]​methyl]​-​4-​oxo-​1-​sulfo-​3-​azetidinyl]​amino]​-​2-​oxoethylidene]​amino]​oxy]​-​2-​methyl-

2-((Z)-1-(2-Aminothiazol-4-yl)-2-((2R,3S)-2-((((1,5-dihydroxy-4-oxo-1,4-dihydropyridin-2-yl)methoxy)carbonylamino)methyl)-4-oxo-1-sulfoazetidin-3-ylamino)-2-oxoethylideneaminooxy)-2-methylpropanoic Acid

2-[[(Z)-[1-(2-Amino-4-thiazolyl)-2-[[(2R,3S)-2-[[[[[(1,4-dihydro-1,5-dihydroxy-4-oxo-2-pyridinyl)methyl]amino]carbonyl]amino]methyl]-4-oxo-1-sulfo-3-azetidinyl]amino]-2-oxoethylidene]amino]oxy]-2-methylpropanoic acid

Monobactams are a class of antibacterial agents which contain a monocyclic beta-lactam ring as opposed to a beta-lactam fused to an additional ring which is found in other beta-lactam classes, such as cephalosporins, carbapenems and penicillins. The drug Aztreonam is an example of a marketed monobactam; Carumonam is another example. The early studies in this area were conducted by workers at the Squibb Institute for Medical Research, Cimarusti, C. M. & R.B. Sykes: Monocyclic β-lactam antibiotics. Med. Res. Rev. 1984, 4, 1 -24. Despite the fact that selected

monobacatams were discovered over 25 years ago, there remains a continuing need for new antibiotics to counter the growing number of resistant organisms.

Although not limiting to the present invention, it is believed that monobactams of the present invention exploit the iron uptake mechanism in bacteria through the use of siderophore-monobactam conjugates. For background information, see: M. J. Miller, et al. BioMetals (2009), 22(1 ), 61-75.

The mechanism of action of beta-lactam antibiotics, including monobactams, is generally known to those skilled in the art and involves inhibition of one or more penicillin binding proteins (PBPs), although the present invention is not bound or limited by any theory. PBPs are involved in the synthesis of peptidoglycan, which is a major component of bacterial cell walls.

WO 2012073138

https://www.google.com/patents/WO2012073138A1?cl=en

Inventors Matthew Frank BrownSeungil HanManjinder LallMark. J. Mitton-FryMark Stephen PlummerHud Lawrence RisleyVeerabahu ShanmugasundaramJeremy T. Starr
Applicant Pfizer Inc.

Example 4, Route 1

2-({[(1Z)-1 -(2-amino-1 ,3-thiazol-4-yl)-2-({(2f?,3S)-2-[({[(1 ,5-dihydroxy-4-oxo-1 ,4- dihydropyridin-2-yl)methyl]carbamoyl}amino)methyl]-4-oxo-1 -sulfoazetidin-3- yl}amino)-2-oxoethylidene]amino}oxy)-2-methylpropanoic acid, bis sodium salt

(C92-Bis Na Salt).

Figure imgf000080_0001

C92-bis Na salt

Step 1 : Preparation of C90. A solution of C26 (16.2 g, 43.0 mmol) in tetrahydrofuran (900 mL) was treated with 1 , 1 ‘-carbonyldiimidazole (8.0 g, 47.7 mmol). After 5 minutes, the reaction mixture was treated with a solution of C9 (15 g, 25.0 mmol) in anhydrous tetrahydrofuran (600 mL) at room temperature. After 15 hours, the solvent was removed and the residue was treated with ethyl acetate (500 mL) and water (500 mL). The layers were separated and the aqueous layer was back extracted with additional ethyl acetate (300 mL). The organic layers were combined, washed with brine solution (500 mL), dried over sodium sulfate, filtered and concentrated in vacuo. The crude product was purified via chromatography on silica gel (ethyl acetate / 2-propanol) to yield C90 as a yellow foam. Yield: 17.44 g, 19.62 mmol, 78%. LCMS m/z 889.5 (M+1 ). 1H NMR (400 MHz, DMSO-d6) 1 1 .90 (br s, 1 H), 9.25 (d, J=8.7 Hz, 1 H), 8.40 (br s, 1 H), 7.98 (s, 1 H), 7.50-7.54 (m, 2H), 7.32-7.47 (m, 8H), 7.28 (s, 1 H), 6.65 (br s, 1 H), 6.28 (br s, 1 H), 5.97 (s, 1 H), 5.25 (s, 2H), 5.18 (dd, J=8.8, 5 Hz, 1 H), 4.99 (s, 2H), 4.16-4.28 (m, 2H), 3.74-3.80 (m, 1 H), 3.29-3.41 (m, 1 H), 3.13-3.23 (m, 1 H), 1.42 (s, 9H), 1.41 (s, 3H), 1.39 (br s, 12H).

Step 2: Preparation of C91. A solution of C90 (8.5 g, 9.6 mmol) in anhydrous N,N- dimethylformamide (100 mL) was treated sulfur trioxide /V,/V-dimethylformamide complex (15.0 g, 98.0 mmol). The reaction was allowed to stir at room temperature for 20 minutes then quenched with water (300 mL). The resulting solid was collected by filtration and dried to yield C91 as a white solid. Yield: 8.1 g, 8.3 mmol, 87%. LCMS m/z 967.6 (M-1 ). 1H NMR (400 MHz, DMSO-d6) δ 1 1.62 (br s, 1 H), 9.29 (d, J=8.8 Hz, 1 H), 9.02 (s, 1 H), 7.58-7.61 (m, 2H), 7.38-7.53 (m, 9H), 7.27 (s, 1 H), 7.07 (s, 1 H), 6.40 (br d, J=8 Hz, 1 H), 5.55 (s, 2H), 5.25 (s, 2H), 5.20 (dd, J=8.8, 5.6 Hz, 1 H), 4.46 (br dd, half of ABX pattern, J=17, 5 Hz, 1 H), 4.38 (br dd, half of ABX pattern, J=17, 6 Hz, 1 H), 3.92-3.98 (m, 1 H), 3.79-3.87 (m, 1 H), 3.07-3.17 (m, 1 H), 1.40 (s, 9H), 1 .39 (s, 3H), 1 .38 (s, 12H).

Step 3: Preparation of C92. A solution of C91 (8.1 g, 8.3 mmol) in anhydrous dichloromethane (200 mL) was treated with 1 M boron trichloride in p-xylenes (58.4 mL, 58.4 mmol) and allowed to stir at room temperature for 15 minutes. The reaction mixture was cooled in an ice bath, quenched with 2,2,2-trifluoroethanol (61 mL), and the solvent was removed in vacuo. A portion of the crude product (1 g) was purified via reverse phase chromatography (C-18 column; acetonitrile / water gradient with 0.1 % formic acid modifier) to yield C92 as a white solid. Yield: 486 mg, 0.77 mmol. LCMS m/z 633.3 (M+1 ). 1H NMR (400 MHz, DMSO-d6) δ 9.22 (d, J=8.7 Hz, 1 H), 8.15 (s, 1 H), 7.26-7.42 (br s, 2H), 7.18-7.25 (m, 1 H), 6.99 (s, 1 H), 6.74 (s, 1 H), 6.32-6.37 (m, 1 H), 5.18 (dd, J=8.7, 5.7 Hz, 1 H), 4.33 (br d, J=4.6 Hz, 2H), 3.94-4.00 (m, 1 H), 3.60-3.68 (m, 1 H), 3.19-3.27 (m, 1 H), 1.40 (s, 3H), 1.39 (s, 3H).

Step 4: Preparation of C92-Bis Na Salt. A flask was charged with C92 (388 mg, 0.61 mmol) and water (5.0 mL). The mixture was cooled in an ice bath and treated dropwise with a solution of sodium bicarbonate (103 mg, 1.52 mmol) in water (5.0 mL). The sample was lyophilized to yield C92-Bis Na Salt as a white solid. Yield: 415 mg, 0.61 mmol, quantitative. LCMS m/z 633.5 (M+1 ). 1H NMR (400 MHz, D20) δ 7.80 (s, 1 H), 6.93 (s, 1 H), 6.76 (s, 1 H), 5.33 (d, J=5.7 Hz, 1 H), 4.44 (ddd, J=6.0, 6.0, 5.7 Hz, 1 H), 4.34 (AB quartet, JAB=17.7 Hz, ΔνΑΒ=10.9 Hz, 2H), 3.69 (dd, half of ABX pattern, J=14.7, 5.8 Hz, 1 H), 3.58 (dd, half of ABX pattern, J=14.7, 6.2 Hz, 1 H), 1.44 (s, 3H), 1.43 (s, 3H).

Alternate preparation of C92

Figure imgf000082_0001

Step 1 : Preparation of C93. An Atlantis pressure reactor was charged with 10% palladium hydroxide on carbon (0.375 g, John Matthey catalyst type A402028-10), C91 (0.75 g, 0.77 mmol) and treated with ethanol (35 mL). The reactor was flushed with nitrogen and pressurized with hydrogen (20 psi) for 20 hours at 20 °C. The reaction mixture was filtered under vacuum and the filtrate was concentrated using the rotary evaporator to yield C93 as a tan solid. Yield: 0.49 g, 0.62 mmol, 80%. LCMS m/z 787.6 (M-1 ). 1H NMR (400 MHz, DMSO-d6) δ 1 1.57 (br s, 1 H), 9.27 (d, J=8.5 Hz, 1 H), 8.16 (s, 1 H), 7.36 (br s, 1 H), 7.26 (s, 1 H), 7.00 (s, 1 H), 6.40 (br s, 1 H), 5.18 (m, 1 H), 4.35 (m, 2H), 3.83 (m, 1 H), 3.41 (m, 1 H), 3.10 (m, 1 H), 1.41 (s, 6H), 1.36 (s, 18H).

Step 2: Preparation of C92. A solution of C93 (6.0 g, 7.6 mmol) in anhydrous dichloromethane (45 mL) at 0 °C was treated with trifluoroacetic acid (35.0 mL, 456 mmol). The mixture was warmed to room temperature and stirred for 2 hours. The reaction mixture was cannulated into a solution of methyl ferf-butyl ether (100 mL) and heptane (200 mL). The solid was collected by filtration and washed with a mixture of methyl ferf-butyl ether (100 mL) and heptane (200 mL) then dried under vacuum. The crude product (~5 g) was purified via reverse phase chromatography (C-18 column; acetonitrile / water gradient with 0.1 % formic acid modifier) and lyophilized to yield C92 as a pink solid. Yield: 1.45 g, 2.29 mmol. LCMS m/z 631.0 (M-1). 1H NMR (400 MHz, DMSO-de) δ 9.20 (d, J=8.7 Hz, 1H), 8.13 (s, 1H), 7.24-7.40 (br s, 2H), 7.16-7.23 (m, 1H), 6.97 (s, 1H), 6.71 (s, 1H), 6.31-6.35 (m, 1H), 5.15 (dd, J=8.7, 5.7 Hz, 1H), 4.31 (br d, J=4.6 Hz, 2H), 3.92-3.98 (m, 1H), 3.58-3.67 (m, 1H), 3.17-3.25 (m, 1H), 1.37 (s, 3H), 1.36 (s, 3H).

Example 4, route 2

2-({[(1Z)-1-(2-amino-1,3-thiazol-4-yl)-2-({(2 ?,3S)-2-[({[(1,5-dihydroxy-4-oxo-^ dihydropyridin-2-yl)methyl]carbamoyl}amino)methyl]-4-oxo-1-sulfoazetidin-3- yl}amino)-2-oxoethylidene]amino}oxy)-2-methylpropanoic acid (C92).

lt

Figure imgf000083_0001

single

enantiomer

Figure imgf000083_0002

Step 1. Preparation of C95. A solution of C94 (50.0 g, 189.9 mmol) in

dichloromethane (100 mL) was treated with trifluoroacetic acid (50.0 mL, 661.3 mmol). The reaction mixture was stirred at room temperature for 24 hours. The dichloromethane and trifluoroacetic acid was displaced with toluene (4 x 150 mL) using vacuum, to a final volume of 120 mL. The solution was added to heptane (250 mL) and the solid was collected by filtration. The solid was washed with a mixture of toluene and heptane (1 : 3, 60 mL), followed by heptane (2 x 80 mL) and dried under vacuum at 50 °C for 19 hours to afford C95 as a solid. Yield: 30.0 g, 158 mmol, 84%. 1H NMR (400 MHz, CDCI3) δ 9.66 (s, 1 H), 7.86 – 7.93 (m, 2H), 7.73 – 7.80 (m, 2H), 4.57 (s, 2H). HPLC retention time 5.1 minutes; column: Agilent Extended C-18 column (75 mm x 3 mm, 3.5 μηη); column temperature 45 °C; flow rate 1.0 mL / minute; detection UV 230 nm; mobile phase: solvent A = acetonitrile (100%), solvent B = acetonitrile (5%) in 10 mM ammonium acetate; gradient elusion: 0-1.5 minutes solvent B (100%), 1.5-10.0 minutes solvent B (5%), 10.0-13.0 minutes solvent B (100%); total run time 13.0 minutes.

Step 2: Preparation of C96-racemic. A solution of C95 (32.75 g; 173.1 mmol) in dichloromethane (550 mL) under nitrogen was cooled to 2 °C. The solution was treated with 2,4-dimethoxybenzylamine (28.94 g, 173.1 mmol) added dropwise over 25 minutes, maintaining the temperature below 10 °C. The solution was stirred for 10 minutes at 2 °C and then treated with molecular sieves (58.36 g, UOP Type 3A). The cold bath was removed and the reaction slurry was stirred for 3 hours at room temperature. The slurry was filtered through a pad of Celite (34.5 g) and the filter cake was rinsed with dichloromethane (135 mL). The dichloromethane filtrate (imine solution) was used directly in the following procedure.

A solution of A/-(ferf-butoxycarbonyl)glycine (60.6 g, 346.1 mmol) in

tetrahydrofuran (622 mL) under nitrogen was cooled to -45 °C and treated with triethylamine (38.5 g, 380.8 mmol). The mixture was stirred for 15 minutes at -45 °C and then treated with ethyl chloroformate (48.8 g, 450 mmol) over 15 minutes. The reaction mixture was stirred at -50 °C for 7 hours. The previously prepared imine solution was added via an addition funnel over 25 minutes while maintaining the reaction mixture temperature below -40 °C. The slurry was treated with triethylamine (17.5 g, 173 mmol) and the reaction mixture was slowly warmed to room temperature over 5 hours and stirred for an additional 12 hours. The reaction slurry was charged with water (150 mL) and the volatiles removed using a rotary evaporator. The reaction mixture was charged with additional water (393 mL) and the volatiles removed using a rotary evaporator. The mixture was treated with methyl ferf-butyl ether (393 mL) and vigorously stirred for 1 hour. The solid was collected by vacuum filtration and the filter cake was rinsed with a mixture of methyl ferf-butyl ether and water (1 : 1 , 400 mL). The solid was collected and dried in a vacuum oven at 50 °C for 16 hours to afford C96- racemic. Yield: 55.8 g, 1 13 mmol, 65%. 1H-NMR (400 MHz, DMSO-d6) δ 7.85 (s, NH), 7.80 (s, 4H), 6.78 (d, J=7.8 Hz, 1 H), 6.25 (m, 1 H), 6.10 (m, 1 H), 4.83 (m, 1 H), 4.38 (d, J=9.5 Hz, 1 H), 3.77-3.95 (m, 3H), 3.62 (s, 3H), 3.45 (m, 1 H), 3.40 (s, 3H), 1.38 (s, 9H). HPLC retention time 6.05 minutes; XBridge C8 column (4.6 x 75 mm, 3.5 μηη); column temperature 45 °C; flow rate 2.0 mL/minute; detection UV 210 nm, 230 nm, and 254 nm; mobile phase: solvent A = methanesulfonic acid (5%) in 10 mmol sodium octylsulfonate, solvent B = acetonitrile (100%); gradient elusion: 0-1.5 minutes solvent A (95%) and solvent B (5%), 1.5-8.5 minutes solvent A (5%) and solvent B (95%), 8.5- 10.0 minutes solvent A (5%) and solvent B (95%), 10.01 -12.0 minutes solvent A (95%) and solvent B (5%); total run time 12.0 minutes.

Step 3: Preparation of C97-racemic. A solution of C96-racemic (15.0 g, 30.3 mmol) in ethyl acetate (150 mL) under nitrogen was treated with ethanolamine (27.3 mL, 454.1 mmol). The reaction mixture was heated at 90 °C for 3 hours and then cooled to room temperature. The mixture was charged with water (150 mL) and the layers separated. The aqueous layer was extracted with ethyl acetate (75 mL) and the combined organic layers washed with water (2 x 150 mL) followed by saturated aqueous sodium chloride (75 mL). The organic layer was dried over magnesium sulfate, filtered and the filtrate concentrated to a volume of 38 mL. The filtrate was treated with heptane (152 mL) and the solid was collected by filtration. The solid was washed with heptane and dried at 50 °C in a vacuum oven overnight to yield C97-racemic as a solid. Yield: 9.68 g, 26.5 mmol, 88%. LCMS m/z 967.6 (M-1 ). 1H NMR (400 MHz, DMSO-d6) δ 7.64 (d, J=9.4 Hz, 1 H), 7.14 (d, J=8.2 Hz, 1 H), 6.56 (s, 1 H), 6.49 (dd, J=8.20, 2.3 Hz, 1 H), 4.78 (dd, J=9.37, 5.1 Hz, 1 H), 4.30 (d, J=14.8 Hz, 1 H), 4.14 (d, J=14.8 Hz, 1 H), 3.77 (s, 3H), 3.75 (s, 3H), 3.45 – 3.53 (m, 1 H), 2.65 – 2.75 (m, 1 H), 2.56 – 2.64 (m, 1 H), 1.38 (s, 9H), 1.30 – 1.35 (m, 2H). HPLC retention time 5.1 minutes; column: Agilent Extended C-18 column (75 mm x 3 mm, 3.5 μΐη); column temperature 45 °C; flow rate 1.0 mL / minute;

detection UV 230 nm; mobile phase: solvent A = acetonitrile (100%), solvent B = acetonitrile (5%) in 10 mM ammonium acetate; gradient elusion: 0-1 .5 minutes solvent B (100%), 1 .5-10.0 minutes solvent B (5%), 10.0-13.0 minutes solvent B (100%); total run time 13.0 minutes. Step 4: Preparation of C97-(2R,3S) enantiomer. A solution of C97-racemic (20.0 g, 54.7 mmol) in ethyl acetate (450 mL) was treated with diatomaceous earth (5.0 g) and filtered through a funnel charged with diatomaceous earth. The filter cake was washed with ethyl acetate (150 mL). The filtrate was charged with diatomaceous earth (20.0 g) and treated with (-)-L-dibenzoyltartaric acid (19.6 g, 54.7 mmol). The slurry was heated at 60 °C for 1.5 hours and then cooled to room temperature. The slurry was filtered and the solid washed with ethyl acetate (90 mL). The solid was collected and dried at 50 °C in a vacuum oven for 17 hours to yield C97-(2R,3S) enantiomer as a solid (mixed with diatomaceous earth). Yield: 17.3 g, 23.9 mmol, 43.6%, 97.6% ee. 1H NMR (400 MHz, DMSO-de) δ 7.89 – 7.91 (m, 4H), 7.59 – 7.65 (m, 3H), 7.44 – 7.49 (m, 4H), 7.09 (d, J=8.3 Hz, 1 H), 6.53 (d, J=2.3 Hz, 1 H), 6.49 (dd, J=8.3, 2.3 Hz, 1 H), 5.65 (s, 2H), 4.85 (dd, J=9.3, 4.9 Hz, 1 H), 4.30 (d, J=15.3 Hz, 1 H), 4.10 (d, J=15.3 Hz, 1 H), 3.74 (s, 3H), 3.72 (s, 3H), 3.68 – 3.70 (m, 1 H), 2.92 – 2.96 (dd, J=13.6, 5.4 Hz, 1 H), 2.85 – 2.90 (dd, J=13.6, 6.3 Hz, 1 H), 1.36 (s, 9H). HPLC retention time 5.1 minutes; column: Agilent Extended C-18 column (75 mm x 3 mm, 3.5 μηη); column temperature 45 °C; flow rate 1.0 mL / minute; detection UV 230 nm; mobile phase: solvent A = acetonitrile (100%), solvent B = acetonitrile (5%) in 10 mM ammonium acetate; gradient elusion: 0-1 .5 minutes solvent B (100%), 1.5-10.0 minutes solvent B (5%), 10.0-13.0 minutes solvent B (100%); total run time 13.0 minutes. Chiral HPLC retention time 9.1 minutes; column: Chiralcel OD-H column (250 mm x 4.6 mm); column temperature 40 °C; flow rate 1 .0 mL / minute; detection UV 208 nm; mobile phase: solvent A = ethanol (18%), solvent B = heptane (85%); isocratic elusion; total run time 20.0 minutes.

Step 5: Preparation of C98-(2R,3S) enantiomer. A solution of C97-(2R,3S) enantiomer. (16.7 g, 23.1 mmol) in ethyl acetate (301 mL) was treated with diatomaceous earth (18.3 g) and 5% aqueous potassium phosphate tribasic (182 mL). The slurry was stirred for 30 minutes at room temperature, then filtered under vacuum and the filter cake washed with ethyl acetate (2 x 67 mL). The filtrate was washed with 5% aqueous potassium phosphate tribasic (18 mL) and the organic layer dried over magnesium sulfate. The solid was filtered and the filter cake washed with ethyl acetate (33 mL). The filtrate was concentrated to a volume of 42 mL and slowly added to heptane (251 mL) and the resulting solid was collected by filtration. The solid was washed with heptane and dried at 50 °C in a vacuum oven for 19 hours to yield C98- (2R,3S) enantiomer as a solid. Yield: 6.4 g, 17.5 mmol, 76%, 98.8% ee. 1H NMR (400 MHz, DMSO-de) δ 7.64 (d, J=9.4 Hz, 1 H), 7.14 (d, J=8.2 Hz, 1 H), 6.56 (s, 1 H), 6.49 (dd, J=8.20, 2.3 Hz, 1 H), 4.78 (dd, J=9.37, 5.1 Hz, 1 H), 4.30 (d, J=14.8 Hz, 1 H), 4.14 (d, J=14.8 Hz, 1 H), 3.77 (s, 3H), 3.75 (s, 3H), 3.45 – 3.53 (m, 1 H), 2.65 – 2.75 (m, 1 H), 2.56 – 2.64 (m, 1 H), 1.38 (s, 9H), 1.30 – 1.35 (m, 2H). HPLC retention time 5.2 minutes; column: Agilent Extended C-18 column (75 mm x 3 mm, 3.5 μηη); column temperature 45 °C; flow rate 1.0 mL / minute; detection UV 230 nm; mobile phase: solvent A = acetonitrile (100%), solvent B = acetonitrile (5%) in 10 mM ammonium acetate; gradient elusion: 0-1 .5 minutes solvent B (100%), 1.5-10.0 minutes solvent B (5%), 10.0-13.0 minutes solvent B (100%); total run time 13.0 minutes. Chiral HPLC retention time 8.7 minutes; column: Chiralcel OD-H column (250 mm x 4.6 mm); column temperature 40 °C; flow rate 1.0 mL / minute; detection UV 208 nm; mobile phase: solvent A = ethanol (18%), solvent B = heptane (85%); isocratic elusion; total run time 20.0 minutes.

Step 6: Preparation of C99. A solution of potassium phosphate tribasic N-hydrate (8.71 g, 41 .05 mmol) in water (32.0 mL) at 22 °C was treated with a slurry of C26- mesylate salt (12.1 g, 27.4 mmol, q-NMR potency 98%) in dichloromethane (100.00 mL). The slurry was stirred for 1 hour at 22 °C. The reaction mixture was transferred to a separatory funnel and the layers separated. The aqueous layer was back extracted with dichloromethane (50.0 mL). The organic layers were combined, dried over magnesium sulfate, filtered under vacuum and the filter cake washed with

dichloromethane (2 x 16 mL). The filtrate (-190 mL, amine solution) was used directly in the next step.

A solution of 1 ,1 ‘-carbonyldiimidazole (6.66 g, 41 .0 mmol) in dichloromethane (100 mL) at 22 °C under nitrogen was treated with the previously prepared amine solution (-190 mL) added dropwise using an addition funnel over 3 hour at 22 °C with stirring. After the addition, the mixture was stirred for 1 hour at 22 °C, then treated with C98-(2R,3S) enantiomer. (10.0 g, 27.4 mmol) followed by /V,/V-dimethylformamide (23.00 mL). The reaction mixture was stirred at 22 °C for 3 hours and then heated at 40 °C for 12 hours. The solution was cooled to room temperature and the dichloromethane was removed using the rotary evaporator. The reaction mixture was diluted with ethyl acetate (216.0 mL) and washed with 10% aqueous citric acid (216.0 mL), 5% aqueous sodium chloride (2 x 216.0 mL), dried over magnesium sulfate and filtered under vacuum. The filter cake was washed with ethyl acetate (3 x 13 mL) and the ethyl acetate solution was concentrated on the rotary evaporator to a volume of (-1 10.00 mL) providing a suspension. The suspension (~1 10.00 mL) was warmed to 40 °C and transferred into a stirred solution of heptane (22 °C) over 1 hour, to give a slurry. The slurry was stirred for 1 hour and filtered under vacuum. The filter cake was washed with heptane (3 x 30 mL) and dried under vacuum at 50 °C for 12 hours to afford C99 as a solid. Yield: 18.1 g, 24.9 mmol, 92%. LCMS m/z 728.4 (M+1 ). 1H NMR (400 MHz, DMSO-d6) δ 8.09 (s, 1 H), 7.62 (d, J=9.4 Hz, 1 H), 7.33-7.52 (m, 10H), 7.07 (d, J=8.3 Hz, 1 H), 6.51 (d, J=2.3 Hz, 1 H), 6.50 (m, 1 H), 6.44 (dd, J=8.3, 2.3 Hz, 1 H), 6.12 (m, 1 H), 6.07 (s, 1 H), 5.27 (s, 2H), 5.00 (s, 2H), 4.73 (dd, J=9.4, 5.2 Hz, 1 H), 4.38 (d, J=15.0 Hz, 1 H), 4.19 (m, 2H), 3.99 (d, J=15.0 Hz, 1 H), 3.72 (s, 3H), 3.71 (s, 3H), 3.48 (m, 1 H), 3.28 (m, 1 H), 3.12 (m, 1 H), 1 .37 (s, 9H).

Step 7: Preparation of C100. A solution of C99 (46.5 g, 63.9 mmol) in acetonitrile (697 mL and water (372 mL) was treated with potassium persulfate (69.1 g, 255.6 mmol) and potassium phosphate dibasic (50.1 g, 287.5 mmol). The biphasic mixture was heated to 75 °C and vigorously stirred for 1.5 hours. The pH was maintained between 6.0-6.5 by potassium phosphate dibasic addition (-12 g). The mixture was cooled to 20 °C, the suspension was filtered and washed with acetonitrile (50 mL). The filtrate was concentrated using the rotary evaporator and treated with water (50 mL) followed by ethyl acetate (200 mL). The slurry was stirred for 2 hours at room temperature, filtered and the solid dried under vacuum at 40 °C overnight. The solid was slurried in a mixture of ethyl acetate and water (6 : 1 , 390.7 mL) at 20 °C for 1 hour then collected by filtration. The solid was dried in a vacuum oven to yield C100. Yield: 22.1 g, 38.3 mmol, 60%. 1H NMR (400 MHz, DMSO-d6) δ 8.17 (br s, 1 H), 7.96 (s, 1 H), 7.58 (d, J=9.6 Hz, 1 H), 7.29-7.50 (m, 10H), 6.49 (dd, J=8.0, 6.0 Hz, 1 H), 6.08 (dd, J=5.6, 5.2 Hz, 1 H), 5.93 (s, 1 H), 5.22 (s, 2H), 4.96 (s, 2H), 4.77 (dd, J=9.6, 5.0 Hz, 1 H), 4.16 (m, 2H), 3.61 (m, 1 H), 3.1 1 (m, 2H), 1.36 (s, 9H). HPLC retention time 6.17 minutes; XBridge C8 column (4.6 x 75 mm, 3.5 μηη); column temperature 45 °C; flow rate 2.0 mL/minute; detection UV 210 nm, 230 nm, and 254 nm; mobile phase: solvent A = methanesulfonic acid (5%) in 10 mmol sodium octylsulfonate, solvent B = acetonitrile (100%); gradient elusion: 0-1 .5 minutes solvent A (95%) and solvent B (5%), 1.5-8.5 minutes solvent A (5%) and solvent B (95%), 8.5-10.0 minutes solvent A (5%) and solvent B (95%), 10.01- 12.0 minutes solvent A (95%) and solvent B (5%); total run time 12.0 minutes.

Step 8: Preparation of C101. A solution of trifluoroacetic acid (120 mL, 1550 mmol) under nitrogen was treated with methoxybenzene (30 mL, 269 mmol) and cooled to -5 °C. Solid C100 (17.9 g, 31.0 mmol) was charged in one portion at -5 °C and the resulting mixture stirred for 3 hours. The reaction mixture was cannulated with nitrogen pressure over 15 minutes to a stirred mixture of Celite (40.98 g) and methyl ferf-butyl ether (550 mL) at 10 °C. The slurry was stirred at 16 °C for 30 minutes, then filtered under vacuum. The filter cake was rinsed with methyl ferf-butyl ether (2 x 100 mL). The solid was collected and slurried in methyl ferf-butyl ether (550 mL) with vigorous stirring for 25 minutes. The slurry was filtered by vacuum filtration and washed with methyl ferf-butyl ether (2 x 250 mL). The solid was collected and dried in a vacuum oven at 60 °C for 18 hours to afford C101 on Celite. Yield: 57.6 g total = C101 + Celite; 16.61 g C101 , 28.1 mmol, 91%. 1H NMR (400 MHz, DMSO-d6) δ 8.75-8.95 (br s, 2H), 8.65 (s, 1 H), 8.21 (s, 1 H), 7.30-7.58 (m, 10H), 6.83 (br s, 1 H), 6.65 (br s, 1 H), 6.17 (s, 1 H), 5.30 (s, 2H), 5.03 (s, 2H), 4.45 (br s, 1 H), 4.22 (br s, 2H), 3.77 (m, 1 H), 3.36 (m, 1 H), 3.22 (m, 1 H). 19F NMR (376 MHz, DMSO-d6) δ -76.0 (s, 3F). HPLC retention time 5.81 minutes; XBridge C8 column (4.6 x 75 mm, 3.5 μηη); column temperature 45 °C; flow rate 2.0 mL/minute; detection UV 210 nm, 230 nm, and 254 nm; mobile phase: solvent A = methanesulfonic acid (5%) in 10 mmol sodium octylsulfonate, solvent B = acetonitrile (100%); gradient elusion: 0-1.5 minutes solvent A (95%) and solvent B (5%), 1.5-8.5 minutes solvent A (5%) and solvent B (95%), 8.5-10.0 minutes solvent A (5%) and solvent B (95%), 10.01-12.0 minutes solvent A (95%) and solvent B (5%); total run time 12.0 minutes.

Step 9: Preparation of C90. A suspension of C101 (67.0 g, 30% activity on Celite = 33.9 mmol) in acetonitrile (281 .4 mL) was treated with molecular sieves 4AE (40.2 g), C5 (17.9 g, 33.9 mmol), 4-dimethylaminopyridine (10.4 g, 84.9 mmol) and the mixture was stirred at 40°C for 16 hours. The reaction mixture was cooled to 20 °C, filtered under vacuum and the filter cake washed with acetonitrile (2 x 100 mL). The filtrate was concentrated under vacuum to a volume of -50 mL. The solution was diluted with ethyl acetate (268.0 mL) and washed with 10% aqueous citric acid (3 x 134 mL) followed by 5% aqueous sodium chloride (67.0 mL). The organic layer was dried over magnesium sulfate and filtered under vacuum. The filter cake was washed with ethyl acetate (2 x 50 mL) and the filtrate was concentrated to a volume of -60 mL. The filtrate was added slowly to heptane (268 mL) with stirring and the slurry was stirred at 20 °C for 1 hour. The slurry was filtered under vacuum and the filter cake washed with a mixture of heptane and ethyl acetate (4: 1 , 2 x 27 mL). The solid was collected and dried under vacuum for 12 hours at 50 °C to afford a solid. The crude product was purified via chromatography on silica gel (ethyl acetate / 2-propanol), product bearing fractions were combined and the volume was reduced to -60 mL. The solution was added dropwise to heptane (268 mL) with stirring. The slurry was stirred at room temperature for 3 hours, filtered and washed with heptane and ethyl acetate (4: 1 , 2 x 27 mL). The solid was collected and dried under vacuum for 12 hours at 50 °C to afford C90 as a solid. Yield: 16.8 g, 18.9 mmol, 58%. LCMS m/z 889.4 (M+1 ). 1H NMR (400 MHz, DMSO-cfe) 1 1.90 (br s, 1 H), 9.25 (d, J=8.7 Hz, 1 H), 8.40 (br s, 1 H), 7.98 (s, 1 H), 7.50-7.54 (m, 2H), 7.32- 7.47 (m, 8H), 7.28 (s, 1 H), 6.65 (br s, 1 H), 6.28 (br s, 1 H), 5.97 (s, 1 H), 5.25 (s, 2H), 5.18 (dd, J=8.8, 5 Hz, 1 H), 4.99 (s, 2H), 4.16-4.28 (m, 2H), 3.74-3.80 (m, 1 H), 3.29-3.41 (m, 1 H), 3.13-3.23 (m, 1 H), 1 .42 (s, 9H), 1 .41 (s, 3H), 1.39 (br s, 12H).

Step 10: Preparation of C91. A solution of C90 (14.5 g, 16.3 mmol) in anhydrous N,N- dimethylformamide (145.0 mL) was treated with sulfur trioxide /V,/V-dimethylformamide complex (25.0 g, 163.0 mmol). The reaction mixture was stirred at room temperature for 45 minutes, then transferred to a stirred mixture of 5% aqueous sodium chloride (290 mL) and ethyl acetate (435 mL) at 0 °C. The mixture was warmed to 18 °C and the layers separated. The aqueous layer was extracted with ethyl acetate (145 mL) and the combined organic layers washed with 5% aqueous sodium chloride (3 x 290 mL) followed by saturated aqueous sodium chloride (145 mL). The organic layer was dried over magnesium sulfate, filtered through diatomaceous earth and the filter cake washed with ethyl acetate (72 mL). The filtrate was concentrated to a volume of 36 mL and treated with methyl ferf-butyl ether (290 mL), the resulting slurry was stirred at room temperature for 1 hour. The solid was collected by filtration, washed with methyl ferf- butyl ether (58 mL) and dried at 50 °C for 2 hours followed by 20 °C for 65 hours in a vacuum oven to yield C91 as a solid. Yield: 15.0 g, 15.4 mmol, 95%. LCMS m/z 967.6 (M-1 ). 1H NMR (400 MHz, DMSO-d6) δ 1 1.62 (br s, 1 H), 9.29 (d, J=8.8 Hz, 1 H), 9.02 (s, 1 H), 7.58-7.61 (m, 2H), 7.38-7.53 (m, 9H), 7.27 (s, 1 H), 7.07 (s, 1 H), 6.40 (br d, J=8.0 Hz, 1 H), 5.55 (s, 2H), 5.25 (s, 2H), 5.20 (dd, J=8.8, 5.6 Hz, 1 H), 4.46 (br dd, half of ABX pattern, J=17.0, 5.0 Hz, 1 H), 4.38 (br dd, half of ABX pattern, J=17.0, 6.0 Hz, 1 H), 3.92- 3.98 (m, 1 H), 3.79-3.87 (m, 1 H), 3.07-3.17 (m, 1 H), 1.40 (s, 9H), 1.39 (s, 3H), 1.38 (s, 12H).

Step 11 : Preparation of C92. A solution of C91 (20.0 g, 20.6 mmol) in

dichloromethane (400 mL) was concentrated under reduced pressure (420 mmHg) at 45 °C to a volume of 200 mL. The solution was cooled to -5 °C and treated with 1 M boron trichloride in dichloromethane (206.0 mL, 206.0 mmol) added dropwise over 40 minutes. The reaction mixture was warmed to 15 °C over 1 hour with stirring. The slurry was cooled to -15 °C and treated with a mixture of 2,2,2-trifluoroethanol (69.2 mL) and methyl ferf-butyl ether (400 mL), maintaining the temperature at -15 °C. The reaction mixture was warmed to 0 °C over 1 hour. The suspension was filtered using nitrogen pressure and the solid washed with methyl ferf-butyl ether (2 x 200 mL).

Nitrogen was passed over the solid for 2 hours. The solid was collected and suspended in methyl ferf-butyl ether (400 mL) for 1 hour with stirring at 18 °C. The suspension was filtered using nitrogen pressure and the solid washed with methyl ferf-butyl ether (2 x 200 mL). Nitrogen was passed over the resulting solid for 12 hours. A portion of the crude product was neutralized with 1 M aqueous ammonium formate to pH 5.5 with minimal addition of /V,/V-dimethylformamide to prevent foaming. The feed solution was filtered and purified via reverse phase chromatography (C-18 column; acetonitrile / water gradient with 0.2% formic acid modifier). The product bearing fractions were combined and concentrated to remove acetonitrile. The solution was captured on a GC-161 M column, washed with deionized water and blown dry with nitrogen pressure. The product was released using a mixture of methanol / water (10: 1 ) and the product bearing fractions were added to a solution of ethyl acetate (6 volumes). The solid was collected by filtration to afford C92 as a solid. Yield: 5.87 g, 9.28 mmol. LCMS m/z 633.3 (M+1 ). 1H NMR (400 MHz, DMSO-d6) δ 9.22 (d, J=8.7 Hz, 1 H), 8.15 (s, 1 H), 7.26-7.42 (br s, 2H), 7.18-7.25 (m, 1 H), 6.99 (s, 1 H), 6.74 (s, 1 H), 6.32-6.37 (m, 1 H), 5.18 (dd, J=8.7, 5.7 Hz, 1 H), 4.33 (br d, J=4.6 Hz, 2H), 3.94-4.00 (m, 1 H), 3.60-3.68 (m, 1 H), 3.19-3.27 (m, 1 H), 1.40 (s, 3H), 1.39 (s, 3H).

PAPER

Journal of Medicinal Chemistry (2014), 57(9), 3845-3855

Siderophore Receptor-Mediated Uptake of Lactivicin Analogues in Gram-Negative Bacteria

Medicinal Chemistry, Computational Chemistry, §Antibacterials Research Unit, and Structural Biology, Pfizer Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
J. Med. Chem.201457 (9), pp 3845–3855
DOI: 10.1021/jm500219c
Publication Date (Web): April 2, 2014
Copyright © 2014 American Chemical Society
*Phone: (860)-686-1788. E-mail: seungil.han@pfizer.com.

Abstract

Abstract Image

Multidrug-resistant Gram-negative pathogens are an emerging threat to human health, and addressing this challenge will require development of new antibacterial agents. This can be achieved through an improved molecular understanding of drug–target interactions combined with enhanced delivery of these agents to the site of action. Herein we describe the first application of siderophore receptor-mediated drug uptake of lactivicin analogues as a strategy that enables the development of novel antibacterial agents against clinically relevant Gram-negative bacteria. We report the first crystal structures of several sideromimic conjugated compounds bound to penicillin binding proteins PBP3 and PBP1a from Pseudomonas aeruginosa and characterize the reactivity of lactivicin and β-lactam core structures. Results from drug sensitivity studies with β-lactamase enzymes are presented, as well as a structure-based hypothesis to reduce susceptibility to this enzyme class. Finally, mechanistic studies demonstrating that sideromimic modification alters the drug uptake process are discussed.

PAPER

Pyridone-Conjugated Monobactam Antibiotics with Gram-Negative Activity

Worldwide Medicinal Chemistry, Computational Chemistry, §Antibacterials Research Unit, Pharmacokinetics, Dynamics & Metabolism, Structural Biology, Pfizer Global Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
J. Med. Chem.201356 (13), pp 5541–5552
DOI: 10.1021/jm400560z
Publication Date (Web): June 11, 2013
Copyright © 2013 American Chemical Society
*Phone: 860-441-3522. E-mail: matthew.f.brown@pfizer.com.
Abstract Image

Herein we describe the structure-aided design and synthesis of a series of pyridone-conjugated monobactam analogues with in vitro antibacterial activity against clinically relevant Gram-negative species including Pseudomonas aeruginosaKlebsiella pneumoniae, and Escherichia coli. Rat pharmacokinetic studies with compound 17 demonstrate low clearance and low plasma protein binding. In addition, evidence is provided for a number of analogues suggesting that the siderophore receptors PiuA and PirA play a role in drug uptake in P. aeruginosa strain PAO1.

STR1

17 as a solid. Yield: 5.87 g, 9.28 mmol. LCMS m/z 633.3 (M+1). 1H NMR (400 MHz, DMSOd6) δ 9.22 (d, J=8.7 Hz, 1H), 8.15 (s, 1H), 7.26-7.42 (br s, 2H), 7.18-7.25 (m, 1H), 6.99 (s, 1H), 6.74 (s, 1H), 6.32-6.37 (m, 1H), 5.18 (dd, J=8.7, 5.7 Hz, 1H), 4.33 (br d, J=4.6 Hz, 2H), 3.94-4.00 (m, 1H), 3.60-3.68 (m, 1H), 3.19-3.27 (m, 1H), 1.40 (s, 3H), 1.39 (s, 3H).

Nc1nc(cs1)\C(=N\OC(C)(C)C(=O)O)C(=O)N[C@@H]3C(=O)N([C@@H]3CNC(=O)NCC2=CC(=O)C(O)=CN2O)S(=O)(=O)O

PAPER

Process Development for the Synthesis of Monocyclic β-Lactam Core 17

Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
Org. Process Res. Dev., Article ASAP
DOI: 10.1021/acs.oprd.7b00359
Publication Date (Web): January 4, 2018
Copyright © 2018 American Chemical Society
Abstract Image

Process development and multikilogram synthesis of the monocyclic β-lactam core 17 for a novel pyridone-conjugated monobactam antibiotic is described. Starting with commercially available 2-(2,2-diethoxyethyl)isoindoline-1,3-dione, the five-step synthesis features several telescoped operations and direct isolations to provide significant improvement in throughput and reduced solvent usage over initial scale-up campaigns. A particular highlight in this effort includes the development of an efficient Staudinger ketene–imine [2 + 2] cycloaddition reaction of N-Boc-glycine ketene 12 and imine 9 to form racemic β-lactam 13 in good isolated yield (66%) and purity (97%). Another key feature in the synthesis involves a classical resolution of racemic amine 15 to afford single enantiomer salt 17 in excellent isolated yield (45%) with high enantiomeric excess (98%).

Figure

https://pubs.acs.org/doi/suppl/10.1021/acs.oprd.7b00359/suppl_file/op7b00359_si_001.pdf

Nc1nc(cs1)\C(=N\OC(C)(C)C(=O)O)C(=O)N[C@@H]3C(=O)N([C@@H]3CNC(=O)NCC2=CC(=O)C(O)=CN2O)S(=O)(=O)O

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J. Med. Chem.201356 (13), pp 5541–5552
DOI: 10.1021/jm400560z

OXYGEN ANALOGUE…………..

STR2
 1380110-45-1, C20 H23 N7 O13 S2, 633.57
Propanoic acid, 2-​[[(Z)​-​[1-​(2-​amino-​4-​thiazolyl)​-​2-​[[(2R,​3S)​-​2-​[[[[(1,​4-​dihydro-​1,​5-​dihydroxy-​4-​oxo-​2-​pyridinyl)​methoxy]​carbonyl]​amino]​methyl]​-​4-​oxo-​1-​sulfo-​3-​azetidinyl]​amino]​-​2-​oxoethylidene]​amino]​oxy]​-​2-​methyl-
2-[[(Z)-[1-(2-Amino-4-thiazolyl)-2-[[(2R,3S)-2-[[[[(1,4-dihydro-1,5-dihydroxy-4-oxo-2-pyridinyl)methoxy]carbonyl]amino]methyl]-4-oxo-1-sulfo-3-azetidinyl]amino]-2-oxoethylidene]amino]oxy]-2-methylpropanoic acid

STR2

18 as a light yellow solid. Yield: 43 mg, 0.068 mmol, 51%. LCMS m/z 634.4 (M+1). 1H NMR (400 MHz, DMSO-d6), characteristic peaks: δ 9.29 (d, J=8.5 Hz, 1H), 8.10 (s, 1H), 7.04-7.10 (m, 1H), 7.00 (s, 1H), 6.75 (s, 1H), 5.05-5.30 (m, 3H), 4.00-4.07 (m, 1H), 1.42 (s, 3H), 1.41 (s, 3H).

Nc1nc(cs1)\C(=N\OC(C)(C)C(=O)O)C(=O)N[C@@H]3C(=O)N([C@@H]3CNC(=O)OCC2=CC(=O)C(O)=CN2O)S(=O)(=O)O

Step 4: Preparation of 18-Bis Na salt. A suspension of 5 (212 mg, 0.33 mmol) in water (10 mL) was cooled to 0 oC and treated with a solution of sodium bicarbonate (56.4 mg, 0.67 mmol) in water (2 mL), added dropwise. The reaction mixture was cooled to -70 oC (frozen) and lyophilized to afford 18-Bis Na salt as a white solid. Yield: 210 mg, 0.31 mmol, 93%. LCMS m/z 632.5 (M-1). 1H NMR (400 MHz, D2O) δ 7.87 (s, 1H), 6.94 (s, 1H), 6.92 (s, 1H), 5.35 (d, J=5 Hz, 1H), 5.16 (s, 2H), 4.46-4.52 (m, 1H), 3.71 (dd, half of ABX pattern, J=14.5, 6 Hz, 1H), 3.55 (dd, half of ABX pattern, J=14.5, 6 Hz, 1H), 1.43 (s, 3H), 1.42 (s, 3H).

WO 2012073138

Inventors Matthew Frank BrownSeungil HanManjinder LallMark. J. Mitton-FryMark Stephen PlummerHud Lawrence RisleyVeerabahu ShanmugasundaramJeremy T. Starr
Applicant Pfizer Inc.

Example 5

disodium 2-({[(1Z)-1 -(2-amino-1 ,3-thiazol-4-yl)-2-({(2R,3S)-2-[({[(1 ,5-dihydroxy-4- oxo-1 ,4-dihydropyridin-2-yl)methoxy]carbonyl}amino)methyl]-4-oxo-1 – sulfonatoazetidin-3-yl}amino)-2-oxoethylidene]amino}oxy)-2-methylpropanoate

(C104-Bis Na salt).

Figure imgf000092_0001

Step 1 : Preparation of C102. A solution of C28 (300 mg, 0.755 mmol) in

tetrahydrofuran (10 mL) was treated with 1 , 1 ‘-carbonyldiimidazole (379 mg, 2.26 mmol) at room temperature and stirred for 20 hours. The yellow reaction mixture was treated with a solution of C9 (286 mg, 0.543 mmol) in tetrahydrofuran (25 mL). The mixture was stirred for 6 hours at room temperature, then treated with water (20 mL) and extracted with ethyl acetate (3 x 25 mL). The combined organic layers were dried over sodium sulfate, filtered and concentrated in vacuo. The crude material was purified via chromatography on silica gel (heptane / ethyl acetate / 2-propanol) to afford C102 as a light yellow solid. Yield: 362 mg, 0.381 mmol, 62%. LCMS m/z 950.4 (M+1 ). 1H NMR (400 MHz, DMSO-de), characteristic peaks: δ 9.31 (d, J=8.4 Hz, 1 H), 8.38 (s, 1 H), 8.00 (s, 1 H), 7.41 (br d, J=8.2 Hz, 2H), 7.36 (br d, J=8.8 Hz, 2H), 7.26 (s, 1 H), 6.10 (s, 1 H), 5.20 (s, 2H), 4.92 (br s, 4H), 3.77 (s, 3H), 3.76 (s, 3H), 1.45 (s, 9H), 1.38 (s, 9H). Step 2: Preparation of C103. A solution of C102 (181 mg, 0.191 mmol) in anhydrous /V,/V-dimethylformamide (2.0 mL) was treated with sulfur trioxide pyridine complex (302 mg, 1.91 mmol). The reaction mixture was allowed to stir at room temperature for 6 hours, then cooled to 0 °C and quenched with water. The resulting solid was collected by filtration and dried in vacuo to yield C103 as a white solid. Yield: 145 mg, 0.14 mmol, 74%. APCI m/z 1028.5 (M-1 ). 1H NMR (400 MHz, DMSO-d6), characteristic peaks: δ 1 1.65 (br s, 1 H), 9.37 (d, J=8.6 Hz, 1 H), 8.87 (s, 1 H), 7.49 (br d, J=8.6 Hz, 2H), 7.43 (br d, J=8.6 Hz, 2H), 7.26 (s, 1 H), 7.01 (br d, J=8.9 Hz, 2H), 7.00 (br d, J=8.8 Hz, 2H), 5.43 (s, 2H), 5.20 (dd, J=8.4, 6 Hz, 1 H), 4.01-4.07 (m, 1 H), 3.78 (s, 3H), 3.77 (s, 3H), 3.50- 3.58 (m, 1 H), 3.29-3.37 (m, 1 H), 1.44 (s, 9H), 1.37 (s, 9H). Step 3: Preparation of C104. A solution of C103 (136 mg, 0.132 mmol) in anhydrous dichloromethane (5 mL) was treated with 1 M boron trichloride in p-xylenes (0.92 mL, 0.92 mmol) and allowed to stir at room temperature for 40 minutes. The reaction mixture was cooled in an ice bath, quenched with water (0.4 mL), and transferred into a solution of methyl ferf-butyl ether: heptane (1 :2, 12 mL). The solvent was removed in vacuo and the crude product was purified via reverse phase chromatography (C-18 column; acetonitrile / water gradient with 0.1 % formic acid modifier) to yield C104 as a light yellow solid. Yield: 43 mg, 0.068 mmol, 51 %. LCMS m/z 634.4 (M+1 ). 1H NMR (400 MHz, DMSO-de), characteristic peaks: δ 9.29 (d, J=8.5 Hz, 1 H), 8.10 (s, 1 H), 7.04- 7.10 (m, 1 H), 7.00 (s, 1 H), 6.75 (s, 1 H), 5.05-5.30 (m, 3H), 4.00-4.07 (m, 1 H), 1 .42 (s, 3H), 1 .41 (s, 3H).

Step 4: Preparation of C104-Bis Na salt. A suspension of C104 (212 mg, 0.33 mmol) in water (10 mL) was cooled to 0 °C and treated with a solution of sodium bicarbonate (56.4 mg, 0.67 mmol) in water (2 mL), added dropwise. The reaction mixture was cooled to -70 °C (frozen) and lyophilized to afford C104-Bis Na salt as a white solid. Yield: 210 mg, 0.31 mmol, 93%. LCMS m/z 632.5 (M-1 ). 1H NMR (400 MHz, D20) δ 7.87 (s, 1 H), 6.94 (s, 1 H), 6.92 (s, 1 H), 5.35 (d, J=5 Hz, 1 H), 5.16 (s, 2H), 4.46-4.52 (m, 1 H), 3.71 (dd, half of ABX pattern, J=14.5, 6 Hz, 1 H), 3.55 (dd, half of ABX pattern, J=14.5, 6 Hz, 1 H), 1.43 (s, 3H), 1 .42 (s, 3H).

////////////Pfizer,  monobactam,  PF-?, 1380110-34-8, pfizer, pf, 1380110-45-1, WO 2012073138, Matthew Frank BrownSeungil HanManjinder LallMark. J. Mitton-FryMark Stephen PlummerHud Lawrence RisleyVeerabahu ShanmugasundaramJeremy T. Starr, preclinical

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