New Drug Approvals

Home » Antihypertensives

Category Archives: Antihypertensives

DRUG APPROVALS BY DR ANTHONY MELVIN CRASTO .....FOR BLOG HOME CLICK HERE

Blog Stats

  • 4,177,081 hits

Flag and hits

Flag Counter

Enter your email address to follow this blog and receive notifications of new posts by email.

Join 2,790 other subscribers
Follow New Drug Approvals on WordPress.com

Archives

Categories

Recent Posts

Flag Counter

ORGANIC SPECTROSCOPY

Read all about Organic Spectroscopy on ORGANIC SPECTROSCOPY INTERNATIONAL 

Enter your email address to follow this blog and receive notifications of new posts by email.

Join 2,790 other subscribers
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

Personal Links

Verified Services

View Full Profile →

Archives

Categories

Flag Counter

SC-52458, FORASARTAN


Forasartan.svg
ChemSpider 2D Image | Forasartan | C23H28N8

SC-52458, FORASARTAN

  • Molecular FormulaC23H28N8
  • Average mass416.522 Da

PHASE 2,  PFIZER, HYPERTENSION

145216-43-9[RN]

5-[(3,5-Dibutyl-1H-1,2,4-triazol-1-yl)methyl]-2-[2-(1H-tetrazol-5-yl)phenyl]pyridine

5-[(3,5-dibutyl-1H-1,2,4-triazol-1-yl)methyl]-2-[2-(2H-1,2,3,4-tetrazol-5-yl)phenyl]pyridine

форасартан[Russian][INN]فوراسارتان[Arabic][INN]福拉沙坦[Chinese][INN]

065F7WPT0B[DBID]

7415[DBID]

UNII-065F7WPT0B[DBID]

SC 52458[DBID]

Type-1 angiotensin II receptor

Forasartan, otherwise known as the compound SC-52458, is a nonpeptide angiotensin II receptor antagonist (ARB, AT1 receptor blocker).[2][3][4][5]

Forasartan, a specific angiotensin II antagonist, is used alone or with other antihypertensive agents to treat hypertension. Forasartan competes with angiotensin II for binding at the AT1 receptor subtype. As angiotensin II is a vasoconstrictor which also stimulates the synthesis and release of aldosterone, blockage of its effects results in a decreases in systemic vascular resistance.

Indications

Forasartan is indicated for the treatment of hypertension[6] and, similar to other ARBs, it protects the kidneys from kidney blood vessel damage caused by increased kidney blood pressure by blocking renin–angiotensin system activation.[7]

Administration

Forasartan is administered in the active oral form [6] which means that it must go through first pass metabolism in the liver. The dose administered ranges between 150 mg-200 mg daily.[6] Increasing to more than 200 mg daily does not offer significantly greater AT1 receptor inhibition.[6] Forasartan is absorbed quickly in the GI, and within an hour it becomes significantly biologically active.[6] Peak plasma concentrations of the drug are reached within one hour.[6]

Contraindications

Negative side effects of Forasartan are similar to other ARBs, and include hypotension and hyperkalemia.[8] There are no drug interactions identified with forasartan.[6]

Bioorganic & Medicinal Chemistry Letters (1994), 4(1), 99-104

PATENT

EP508445

https://worldwide.espacenet.com/patent/search/family/024755845/publication/EP0508445A1?q=EP508445A1

PATENT

WO1992018092

Example 2

2-[5-[(3,5-dibutyl-1H-1,2,4-triazol-1-yI)methyl]- 2-pyridinyl]benzoic acid

Step 1 : Preparation of 2-bromo-5-picoline .

A solution of 1500 mL (14 mol) of 48%
hydrobromic acid was cooled to 10 °C and 300 g (2.8 mol) of 2-amino-5-picoline (Aldrich) was added slowly. The
solution was maintained at or below 0 °C while 450 mL (8.8 mol) of bromime was added dropwise. After the bromine addition was complete, a solution of 500 g (7.3 mol) of sodium nitrite in 1000 mL of water was added slowly over 6 h. The reaction pH was adjusted by the careful addition of 1500 mL (56 mol) of 50% sodium hydroxide at such a rate that the temperature was maintained below 30 °C. The product precipitated from the nearly colorless reaction mixture; filtration gave 450 g (94%) of 2-bromo-5-picoline as a yellow powder: mp 38-40 °C; NMR 7.27 (s, 1H), 7.28 (s, 1H), 7.12 (br s, 1H).

Step 2 : Preparation of N-methyl-N-tertbutylbenzamide.

Under nitrogen, 96.7 g (1.1 mol) of N-methyl-N-tertbutylamine and 111 g (1.1 mol) of triethylamine was dissolved in 1050 mL of anhydrous tetrahydrofuran (THF).

The solution was cooled to 0 °C and treated with 140.6 σ (1.0 mol) of benzoyl chloride. The reaction was allowed to slowly warm to ambient temperature and stir overnight.
Filtration and subsequent concentration in vacuo of the filtrate gave the crude product which was purified by sublimation (65 °, 0.2 torr) to give 184 g (96%) of
colorless N-methyl-N-tertbutybenzamide: mp 80.5-82.0 °C; NMR (CDCI3) δ1.52 (s, 9H), 2.87 (s, 3H), 7.34-7.40 (m, 3H), 7.40-7.46 (m, 2H).

Step 3 : Preparation of 2-(N-methyl-N-tertbutylcarboxamido)phenyIboronic acid.

Under nitrogen, a solution of 50.0 g (262 mmol) of N-methyl-N-tertbutylbenzamide from step 2 and 44 ml (2S2 mmol) of tetramethylethylenediamine (TMEDA) in 3350 mL of anhydrous THF was cooled to -78 °C and slowly treated with 262 mmol of sec-butyllithium in cyclohexane. After 1 h at -78 °C, the reaction was treated with 45 mL (393 mmol) of trimethyl borate and allowed to slowly warm to ambient temperature overnight with stirring. The reaction was concentrated in vacuo; the residue was dissolved in IK sodium hydroxide and extracted with methylene chloride. The pH of the aqueous phase was adjusted to six with dilute hydrochloric acid and extracted with methylene chloride; the organic layer was dried (MgSO4) and concentrated in vacuo to give 55.7 g (90%) of a 80:20 mixture of syn/anti isomers of 2-(N-methyl-N-tertbutylcarboxamido)phenyIboronic acid as a pale yellow glass: NMR (CDCI3) δ 1.30 (s, syn C(CH3)3, 7.3H), 1.54 (s, anti 0(0.3)3, 1.7H), 2.81 (s, anti CH3, 0.6H), 2.94 (s, syn CH3, 2.4H), 7.29-7.46 (m, 3H), 7.95-8.01 (m, 1H).

step 4 : Preparation of N-methyl-N-tertbwtyl-2-(5-methyl-2-pyridinyl)benzamide.

Under nitrogen, 4.44 g (25.8 mmcl) cf 2-bromo-5-picoline from step 1 in 60 mL of toluene was treated with 6.75 g (29 mmol) of 2- (N-methyl-N- tertbutylcarboxamido)phenyIboronic acid from step 3, 1.0 g of tetrakis (triphenylphosphine)palladium zero, 26 mL of ethanol, and 29 mL of 2M sodium carbonate; this mixture was heated to reflux and vigorously stirred for 24 h. The reaction was partitioned between water and ether; the organic layer was separated, dried (MgSθ4), and
concentrated in vacuo. Purification by silica gel
chromatography (Waters Prep-500A) using ethyl
acetate/hexane (1:2) gave 6.51 g (90%) of N-methyl-N- tertbutyl-2-(5-methyl-2-pyridinyl)benzamide as an oil : NMR (CDCI3) δ 1.40 (s, 9H), 2.33 (s, 3H), 2.61 (s, 3H), 7.27- 7.33 (m, 1H), 7.35-7.41 (m, 2H), 7.47-7.51 (m, 2H), 7.60- 7.66 (m, 1H), 8.43 (br s, 1H).

Step 5 : Preparation of sodium 2-(5-methyl-2- pyridinyl)benzoate.

Under nitrogen, 6.5 g (23 mmol) of N-methyl-N- tertbutyl-2-(6-methyl-3-pyridinyl)benzamide from step 4 was treated with 65 mL of anhydrous trifluoroacetic acid (TFA) at reflux for 6 h. The reaction was concentrated in vacuo and the residue dissolved in water. The pH was adjusted to 10 with aqueous sodium hydroxide and lyophilized to give the sodium salt of 2- (5-methyl-2-pyridinyl)benzoic acid as a colorless solid: NMR [CDCI3/CF3CO2H (97:3)] δ 2.62 (s, 3H), 7.42-7.48 (m, 1H), 7.67-7.80 (m, 3H), 8.18-8.24 (m, 1H), 8.28 (dd, J=8 and 2 HZ, 1H), 7.67-7.80 (m, 3H), 8.18-8.24 (m, 1H), 8.28 (dd, J=8 and 2 Hz, 1H), 8.61 (s, 1H) ; MS (FAB) m/e (rel intensity) 214 (20), 196 (100); HRMS.
Calc’d for M+H: 214.0868. Found: 214.0846.

step 6 : Preparation of ethyl 2-(5-methyl-2-pyridinyl)benzoate.

Under nitrogen, the crude sodium salt from step 5 was suspended in 50 mL of chloroform and treated with 9 mL (103 mmol) of oxalyl chloride. The reaction was stirred for 72 h, filtered under nitrogen, and concentrated in vacuo; the residue was dissolved in absolute ethanol.
Concentration in vacuo gave 2.0 g (8 mmol) of ethyl 2-(5-methyl-2-pyridinyl)benzoate as a brown oil: NMR (CDCI3) δ 1.09 (t, J=7 Hz, 3H), 2.36 (s, 3H), 4.15 (q, J=7 Hz, 2H), 7.34 (d, J=8 Hz, 1H), 7.38-7.48 (m, 1H), 7.48-7.58 (m, 3H), 7.80 (d, J=8 Hz, 1H), 8.46 (s, 1H).

Step 7 : Preparation of ethyl 2-(5-bromomethyl-2-pyridinyl)benzoate.

Under nitrogen, the crude ethyl 2-(5-methyl-2-pyridinyl)benzoate from step 6 was treated with 1.7 g (9.5 mmol) of NBS and 160 mg (0.66 mmol) of benzoyl peroxide in 145 mL of anhydrous carbon tetrachloride at reflux for 2.5 h. The reaction was filtered under nitrogen and
concentrated in vacuo to give crude ethyl 2-(5-bromomethyl-2-pyridinyl)benzoate; no purification was attempted.

step 8 : Preparation of ethyl 2-[5-[(3,5-dibutyl-1H- 1 , 2 , 4-triazol-1 -yl )methy] 1 -2-pyridinyl ] benzoate .

Under nitrogen, 630 mg (3.5 mmol) of 3,5-dibutyl-1H-1,2,4-triazole from step 3 of Example 1 was added in small portions to 5.4 mmol of sodium hydride in 8 mL of DMF; stirring was continued until hydrogen evolution had ceased. The anion solution was cooled to 0 °C and treated with a solution of the crude ethyl 2-(5-bromomethyl-2-pyridinyl)benzoate from step 7 in 10 mL of DMF. The reaction was stirred at ambient temperature overnight, quench with 1 mL of absolute ethanol, and concentrated in vacuo; the resulting residue was redisolved in methylene chloride, filtered, and reconcentrated in vacuo to give crude ethyl 2-[5-[(3,5-dibutyl-1H-1,2,4-triazol-1-yl)methyl]-2-pyridinyl]benzoate.

step 9 : Preparation of 2- [5- [ (3, 5-dibutyl-1H-1 , 2, 4 -triazol-1-yl)methyl]-2-pyridinyllbenzoic acid.

A 1.0 g sample of the crude ethyl 2-[5-[(3,5-dibutyl-1H-1,2,4-triazol-1-yl)methyl]-2-pyridinyl]benzoate from step 8 in 10 mL of water was treated with 3 mL of 101 aqueous sodium hydroxide and stirred at ambient temperature overnight. The reaction mixture was washed with 30 mL of ether and the pH adjusted to six with dilute hydrochloric acid. Purification by reverse phase chromatography (Waters Deltaprep-3000) using isocratic acetonitrile/water (28:72) (0.05% TFA) gave 5 mg of 2-[5-[(3,5-dibutyl-1H-1,2,4-triazol-1-yl)methyl]-2-pyridinyl]benzoic acid: NMR (D2O + NaO3S(CH2)3 Si(CH3)3] δ 0.80 (t, J=7 Hz, 3H), 0.86 (t, J=7 Hz, 3H), 1.19-1.33 (m, 4H), 1.54-1.68 (m, 4H), 2.65 (t, J=7 Hz, 2H), 2.82 (t, _ϊ=7 Hz, 2H), 5.43 (s, 2H), 7.45-7.59 (m, 5H), 7.64 (dd, J=8 and 2 Hz, 1H), 8.37-8.45 (m, 1H); MS (FAB) m/e (rel intensity) 393 (80), 375 (30), 212 (40), 182 (100); HRMS. Calc’d for M+Li: 399.2373. Found:
399.2374.

Example 3

5-[2-[5-[(3,5-dibutyl-1H-1,2,4-triazol-1-yl)methyl]- 2-pyridinyl]phenyl]-1H-tetrazole

Step 1 : Preparation of 2-bromo-5-bromomethylpyridine.

A solution of 296.3 g (1.72 mol) of 2-bromo-5-picoline from step 1 of Example 2 in 6000 mL of carbon tetrachloride was treated with 306.5 g (1.72 mol) of N-bromosuccinimide (NBS) and 28.3 g (173 mmol) of
azobisisobutyronitrile (AIBN). The reaction was stirred at reflux under nitrogen for 3 h, filtered, and concentrated in vacuo providing 476 g of crude 2-bromo-5-bromomethylpyridine as a brownish yellow solid (NMR indicates that this material is only 60% monobromomethyl product): NMR (CDCI3 δ 4.42 (s, 2H), 7.48 (d, .J=9 Hz, 1H), 7.60 (dd, J=9 and 3 Hz, 1H), 8.37 (d, J=3 Hz, 1H).

Step 2: Preparation of 2-bromo-5-[(3.5-dibutyl-1H-1,2,4-triazol-1-yl)methyl]pyridine.

Under nitrogen, 3.15 g (17 mmol) of solid 3,5-dibutyl-1H-1,2,4-triazole from step 3 of Example 1 was added in small portions to 33 mmol of sodium hydride in 31 ml of dimethylformamide (DMF); stirring was continued until hydrogen evolution had ceased. The anion solution was cooled to 0 °C and treated with a solution of 7.9 g (19 mmol) of crude 2-bromo-5-bromomethylpyridine from step 1 in 10 ml of dry DMF. The reaction was allowed to warm to ambient temperature and stir overnight. Methanol (10 ml) was added to destroy any unreacted sodium hydride and the

DMF was removed in vacuo. The residue was dissolved in ethyl acetate, washed with water, and dried (MgSO4).
Silica gel chromatography (Waters Prep-500A) using ethyl acetate/hexane (60:40) gave 4.8 g (47%) of 2-bromo-5-[(3,5- dibutyl-1H-1,2,4-triazol-1-yl)methyl]pyridine as an oil: NMR (CDCI3) δ 0.88 (t, J=7 Hz, 1H), 0.92 (t, J=7 Hz, 1H), 1.27-1.44 (m, 4H), 1.59-1.76 (m, 4H), 2.60-2.71 (m, 4H), 5.18 (s, 2H), 7.35 (dd, J=8 and 3 Hz), 7.46 (d, J=8 Hz, 1H), 8.23 (d, .1=3 Hz, 1H).

Step 3: Preparation of 5-[2-[5-[(3,5-dibutyl-1H-1,2,4- triazol-1-yl)methyl]-2-pyridinyl]phenyl]-1H-tetrazole.

Under nitrogen, 1.03 g (2.9 mmol) of 2-bromo-5- [(3,5-dibutyl-1H-1,2,4-triazol-1-yl)methyl]pyridine from step 2 and 2.46 g (5.7 mmol) of 2-(N-triphenyImethyltetrazol-5-yl)phenyIboronic acid from step 5 of Example 1 were treated with 1.0 g (0.86 mmol) of tetrakis (triphenyl-phosphine)palladium zero, 15 mL of toluene, 10 mL of ethanol, and 6.3 mL of 2M aqueous sodium carbonate. The reaction mixture was heated to reflux and vigorously stirred overnight. The product was purified by reverse phase chromatography (Waters Deltaprep-3000) using acetonitrile/water (20-40:80-60) (0.05% TFA). The pure fractions (by analytical HPLC) were combined, the
acetonitrile removed in vacuo, the pH adjusted to four with dilute sodium hydroxide, and the resulting suspension extracted 4 times with ether. The extracts were combined, dried (MgSθ4), and concentrated in vacuo to give 340 mg (28%) of 5-[2-[5-[(3,5-dibutyl-1H-1,2,4-triazol-1-yl)methyl]-2-pyridinyl]phenyl-1H-tetrazole as a colorless solid: mp 139-141 °C; NMR (CD3OD) δ 0.90 (t, J=7 Hz, 3H), 0.93 (t, J=7 Hz, 3H), 1.29-1.44 (m, 4H), 1.58-1.75 (m, 4H), 2.65 (t, J=7 Hz, 2H), 2.81 (t, J=7 Hz, 2H), 5.40 (s, 2H), 7.47 (d, J=8 Hz, 1H), 7.61-7.77 (m, 5H), 8.33 (d, J=2 Hz, 1H); MS (FAB) m/e (rel intensity) 417 (100), 208 (30); HRMS. Calc’d for M+H: 417.2515. Found: 417.2527.

PATENT

WO2001076573

////////

str1
Flag Counter

AS ON DEC2021 3,491,869 VIEWS ON BLOG WORLDREACH AVAILABLEFOR YOUR ADVERTISEMENT

wdt-16

join me on Linkedin

Anthony Melvin Crasto Ph.D – India | LinkedIn

join me on Researchgate

RESEARCHGATE

This image has an empty alt attribute; its file name is research.jpg

join me on Facebook

Anthony Melvin Crasto Dr. | Facebook

join me on twitter

Anthony Melvin Crasto Dr. | twitter

+919321316780 call whatsaapp

EMAIL. amcrasto@amcrasto

/////////////////////////////////////////////////////////////////////////////

Pharmacology

The angiotensin II receptor, type 1

Angiotensin II binds to AT1 receptors, increases contraction of vascular smooth muscle, and stimulates aldosterone resulting in sodium reabsorption and increase in blood volume.[9] Smooth muscle contraction occurs due to increased calcium influx through the L-type calcium channels in smooth muscle cells during the plateau component, increasing the intracellular calcium and membrane potential which sustain depolarization and contraction.[10]

Effects

Forasartan is a competitive and reversible ARB that competes with the angiotensin II binding site on AT1[11] and relaxes vascular smooth muscle,[10] resulting in decreased blood pressure. Forasartan has a high affinity for the AT1 receptor (IC50=2.9 +/- 0.1nM).[12] In dogs, it was found to block the pressor response of Angiotensin II with maximal inhibition, 91%.[10] Forasartan administration selectively inhibits L-type calcium channels in the plateau component of the smooth muscle cells, favoring relaxation of the smooth muscle.[10] Forasartan also decreases heart rate by inhibiting the positive chronotropic effect of high frequency preganglionic stimuli.[13]

Scarce use

Even though experiments have been conducted on rabbits,[6] guinea pigs,[10] dogs [14] and humans,[6][13] forasartan is not a popular drug of choice for hypertension due to its short duration of action; forasartan is less effective than losartan.[6] Research demonstrates that forasartan is also significantly less potent than losartan.[6]

See also

References

  1. ^ Bräse, Stefan; Banert, Klaus (2010). Organic Azides: Syntheses and Applications. New York: Wiley. p. 38. ISBN 978-0-470-51998-1.
  2. ^ Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, et al. (January 2011). “DrugBank 3.0: a comprehensive resource for ‘omics’ research on drugs”Nucleic Acids Research. DrugBank. 39 (Database issue): D1035-41. doi:10.1093/nar/gkq1126PMC 3013709PMID 21059682.
  3. ^ Wishart DS, Knox C, Guo AC, Cheng D, Shrivastava S, Tzur D, et al. (January 2008). “DrugBank: a knowledgebase for drugs, drug actions and drug targets”Nucleic Acids Research36 (Database issue): D901-6. doi:10.1093/nar/gkm958PMC 2238889PMID 18048412.
  4. ^ Wishart DS, Knox C, Guo AC, Shrivastava S, Hassanali M, Stothard P, et al. (January 2006). “DrugBank: a comprehensive resource for in silico drug discovery and exploration”Nucleic Acids Research34 (Database issue): D668-72. doi:10.1093/nar/gkj067PMC 1347430PMID 16381955.
  5. ^ Olins GM, Corpus VM, Chen ST, McMahon EG, Palomo MA, McGraw DE, et al. (October 1993). “Pharmacology of SC-52458, an orally active, nonpeptide angiotensin AT1 receptor antagonist”. Journal of Cardiovascular Pharmacology22 (4): 617–25. doi:10.1097/00005344-199310000-00016PMID 7505365S2CID 93468.
  6. Jump up to:a b c d e f g h i j k Hagmann M, Nussberger J, Naudin RB, Burns TS, Karim A, Waeber B, Brunner HR (April 1997). “SC-52458, an orally active angiotensin II-receptor antagonist: inhibition of blood pressure response to angiotensin II challenges and pharmacokinetics in normal volunteers”. Journal of Cardiovascular Pharmacology29 (4): 444–50. doi:10.1097/00005344-199704000-00003PMID 9156352.
  7. ^ Naik P, Murumkar P, Giridhar R, Yadav MR (December 2010). “Angiotensin II receptor type 1 (AT1) selective nonpeptidic antagonists–a perspective”. Bioorganic & Medicinal Chemistry18 (24): 8418–56. doi:10.1016/j.bmc.2010.10.043PMID 21071232.
  8. ^ Ram CV (August 2008). “Angiotensin receptor blockers: current status and future prospects”. The American Journal of Medicine121 (8): 656–63. doi:10.1016/j.amjmed.2008.02.038PMID 18691475.
  9. ^ Higuchi S, Ohtsu H, Suzuki H, Shirai H, Frank GD, Eguchi S (April 2007). “Angiotensin II signal transduction through the AT1 receptor: novel insights into mechanisms and pathophysiology”. Clinical Science112 (8): 417–28. doi:10.1042/cs20060342PMID 17346243.
  10. Jump up to:a b c d e Usune S, Furukawa T (October 1996). “Effects of SC-52458, a new nonpeptide angiotensin II receptor antagonist, on increase in cytoplasmic Ca2+ concentrations and contraction induced by angiotensin II and K(+)-depolarization in guinea-pig taenia coli”. General Pharmacology27 (7): 1179–85. doi:10.1016/s0306-3623(96)00058-4PMID 8981065.
  11. ^ Olins GM, Chen ST, McMahon EG, Palomo MA, Reitz DB (January 1995). “Elucidation of the insurmountable nature of an angiotensin receptor antagonist, SC-54629”. Molecular Pharmacology47 (1): 115–20. PMID 7838120.
  12. ^ Csajka C, Buclin T, Fattinger K, Brunner HR, Biollaz J (2002). “Population pharmacokinetic-pharmacodynamic modelling of angiotensin receptor blockade in healthy volunteers”. Clinical Pharmacokinetics41 (2): 137–52. doi:10.2165/00003088-200241020-00005PMID 11888333S2CID 13185772.
  13. Jump up to:a b Kushiku K, Yamada H, Shibata K, Tokunaga R, Katsuragi T, Furukawa T (January 2001). “Upregulation of immunoreactive angiotensin II release and angiotensinogen mRNA expression by high-frequency preganglionic stimulation at the canine cardiac sympathetic ganglia”Circulation Research88 (1): 110–6. doi:10.1161/01.res.88.1.110PMID 11139482.
  14. ^ McMahon EG, Yang PC, Babler MA, Suleymanov OD, Palomo MA, Olins GM, Cook CS (June 1997). “Effects of SC-52458, an angiotensin AT1 receptor antagonist, in the dog”American Journal of Hypertension10 (6): 671–7. doi:10.1016/s0895-7061(96)00500-6PMID 9194514.
Clinical data
Other namesSC-52458
Pregnancy
category
Not assigned
Routes of
administration
Oral
ATC codeC09CA (WHO)
Legal status
Legal statusDevelopment halted, never marketed[1]
Pharmacokinetic data
Elimination half-life1–2 hours
Identifiers
showIUPAC name
CAS Number145216-43-9
PubChem CID132706
DrugBankDB01342
ChemSpider117146
UNII065F7WPT0B
KEGGD04243
ChEBICHEBI:141552
ChEMBLChEMBL315021
CompTox Dashboard (EPA)DTXSID70162942 
Chemical and physical data
FormulaC23H28N8
Molar mass416.533 g·mol−1
3D model (JSmol)Interactive image
showSMILES
showInChI

////////SC-52458, FORASARTAN, форасартан , فوراسارتان , 福拉沙坦 , PHASE 2,  PFIZER, HYPERTENSION

CCCCC1=NN(CC2=CN=C(C=C2)C2=CC=CC=C2C2=NNN=N2)C(CCCC)=N1

wdt-1

NEW DRUG APPROVALS

one time

$10.00

Naftopidil, KT 611


Naftopidil.png

Naftopidil

1-[4-(2-methoxyphenyl)piperazin-1-yl]-3-naphthalen-1-yloxypropan-2-ol

C24H28N2O3, 392.49

CAS 57149-07-2

KT-611FlivasAvishot

1-(4-(2-methoxyphenyl)piperazin-1-yl)-3-(naphthalen-1-yloxy)propan-2-ol

Naftopidil (Flivas)BM-15275NaftopidilCAS Registry Number: 57149-07-2 
CAS Name: 4-(2-Methoxyphenyl)-a-[(1-naphthalenyloxy)methyl]-1-piperazineethanolAdditional Names:RS-1-[4-(2-methoxyphenyl)-1-piperazinyl]-3-(1-naphthoxy)-2-propanol; 1-(2-methoxyphenyl)-4-[3-(naphth-1-yloxy)-2-hydroxypropyl]-piperazine 
Manufacturers’ Codes: KT-611Trademarks: Avishot (Kanebo); Flivas (Asahi)Molecular Formula: C24H28N2O3Molecular Weight: 392.49Percent Composition: C 73.44%, H 7.19%, N 7.14%, O 12.23%Literature References: a1-Adrenergic blocker and serotonin (5HT1A) receptor agonist. Prepn: E. C. Witte et al.,DE2408804eidem,US3997666 (1975, 1976 both to Boehringer Mann.). Clinical pharmacodynamics: R. Kirsten et al.,Eur. J. Clin. Pharmacol.46, 271 (1994). Clinical pharmacokinetics: M. J. G. Farthing et al.,Postgrad. Med. J.70, 363 (1994). HPLC determn in human plasma: G. Niebch et al.,J. Chromatogr.534, 247 (1990). Clinical evaluation in BPH: K. Yasuda et al.,Prostate25, 46 (1994). Review of pharmacology and clinical experience: H. M. Himmel, Cardiovasc. Drug Rev.12, 32-47 (1994). 
Properties: Crystals from isopropanol, mp 125-126°; also reported as colorless crystals, mp 125-129°. Insol in water. Partition coefficient (octanol/water): 75. LD50 in mice, rats (g/kg): 1.3, 6.4 orally (Himmel).Melting point: mp 125-126°; mp 125-129°Log P: Partition coefficient (octanol/water): 75Toxicity data: LD50 in mice, rats (g/kg): 1.3, 6.4 orally (Himmel) 
Derivative Type: DihydrochlorideCAS Registry Number: 57149-08-3Molecular Formula: C24H28N2O3.2HClMolecular Weight: 465.41Percent Composition: C 61.94%, H 6.50%, N 6.02%, O 10.31%, Cl 15.24%Properties: Crystals from methanol/ethanol (1:2), mp 212-213°.Melting point: mp 212-213° 
Therap-Cat: Antihypertensive; a-blocker in treatment of symptomatic benign prostate hypertrophy.Keywords: a-Adrenergic Blocker; Antihypertensive.

Naftopidil (INN, marketed under the brand name Flivas) is a drug used in benign prostatic hypertrophy which acts as a selective α1-adrenergic receptor antagonist or alpha blocker.[1]

PATENT

DE 2408804

CN 101671317

CN 102816136

JP 2013023467

JP 2014118360

IN 2011CH00466

US 20150353473

CN 104744405

IN 2013CH06042

IN 2012DE02071

JP 2016044182

PAPER

ChemMedChem (2009), 4(3), 393-9.

The Journal of organic chemistry (2013), 78(18), 9076-84.

e-EROS Encyclopedia of Reagents for Organic Synthesis (2014), 1-5

European journal of medicinal chemistry (2015), 96, 83-91.

Bioorganic & medicinal chemistry letters (2018), 28(9), 1534-1539.

ChemistrySelect (2019), 4(26), 7745-7750.

Green Chemistry (2019), 21(16), 4422-4433.  |

PAPER

https://www.scielo.br/j/jbchs/a/q5qDxfT9mSwtL9hhQYxyhgs/?lang=en#

(S)-1-(4-(2-Methoxyphenyl)piperazin-1-yl)-3-(naphthalene1-yloxy)propan-2-ol (2b) To a solution of epoxide 8b (0.1 g, 0.5 mmol) in anhydrous 2-propanol (10 mL) was added 1-(2-methoxyphenyl) piperazine (0.096 g, 0.5 mmol) and the reaction mixture was refluxed for 32 h. After completion of reaction, the solvent was removed under reduced pressure and purification was carried out by flash column chromatography (230-400 mesh silica). The EtOAc:petroleum ether (60:40) was used as solvent system for elution, it afforded the (S)-(+)-naftopidil 2b as a yellow solid (0.156 g, 80%); mp 126-127°C; [α]D 25 +4.3o (c 1.55, MeOH);3 [α]D 25 +4.5o (c 1.5, MeOH); IR (CHCl3) νmax/cm-1 3403, 3031, 2977, 2907, 1261, 1225; 1 H NMR (300 MHz, CDCl3) d 2.58-2.70 (m, 4H, N-CH2), 2.80-2.85 (m, 2H, CH2N), 3.03-3.51 (m, 4H, NCH2), 3.51 (bs, 1H, OH), 3.75 (s, 3H, OCH3), 4.02-4.10 (m, 2H, OCH2), 4.19-4.23 (m, 1H, CH), 6.72-6.85 (m, 2H, Ar-H), 6.83-6.85 (d, 2H, J 3.9 Hz, Ar-H), 6.87-6.95 (1H, m, Ar-H), 7.14-7.29 (1H, m, Ar-H), 7.33-7.42 (3H, m, Ar-H), 7.69-7.72 (m, 1H, Ar-H), 8.19-8.22 (m, 1H, Ar-H); 13C NMR (75 MHz, CDCl3) d 50.44 (NCH2), 53.43 (NCH2), 55.17 (OCH3), 60.85 (CH2N), 65.47 (CH), 70.36 (OCH2), 104.73 (Ar), 111.03 (Ar), 118.05 (Ar), 120.39 (Ar), 120.83 (Ar), 121.78 (Ar), 122.91 (Ar), 125.07 (Ar), 125.41 (Ar), 125.67 (Ar), 126.26 (Ar), 127.32 (Ar), 134.31 (Ar), 140.87 (Ar), 152.04 (Ar), 154.21 (Ar); LC-MS m/z 393.36 (M+ + 1), 415.36 (M+ + Na); For compound 2a: [α]D 25 -10.6o (c 1, MeOH,);6 [α]D 25 -11.7o (c 1, MeOH).

PATENT

CN 1473820

PATENT

WO 2018026371

https://patents.google.com/patent/WO2018026371A1/en

PATENT

JP-2021104982

Naftopidil monohydrochloride dihydrate and its use for the preparation of naftopidil , which is known as an ameliorating agent for dysuria associated with benign prostatic hyperplasia.Naftopidil is known as an ameliorating agent for dysuria associated with benign prostatic hyperplasia. Since naftopidil is administered as a free form, there is a need for a method for preparing the free form that can be obtained efficiently and with high purity. 
Japanese Unexamined Patent Publication No. 50-12186 (Patent Document 1) discloses a method for preparing naftopidil, and states that naftopidil was obtained in a yield of 29% to 79% in the examples thereof. In particular, in Example 3, naftopidil is obtained via naftopidil hydrochloride anhydride, but the yield is 49%, and the purity is not described. 
Japanese Patent Application Laid-Open No. 2013-23467 (Patent Document 2) reacts 1- (2-methoxyphenyl) piperazin with 2-[(1-naphthyloxy) methyl] oxylane to obtain crude naftopidil, which is obtained as toluene. Discloses a method for obtaining purified naftopidil from water and water, as well as a mixed solvent of toluene and methanol. In this method, the yield of crude naftopidil did not reach 80%, and the purity after two purification operations using toluene and water, and then toluene and methanol was said to be 99.62% at the highest. ing. In this method, crude naftopidil is not chlorinated with hydrochloric acid. 
In Indian patent application 466 / CHE / 2011 (Patent Document 3), crude naftopidil was recrystallized from ethyl acetate to obtain naftopidil in a yield of 79% and a purity of 99.90%, and further recrystallized from methanol to obtain purity. It discloses a method of obtaining 99.99% naftopidil. Even with this method, crude naftopidil is not chlorinated with hydrochloric acid. 
Indian Patent Application 2071 / DEL / 2012 (Patent Document 4) discloses a method for producing green chemical naftopidil using metal nanoparticles. Here, naftopidil is purified by column chromatography using silica gel to obtain naftopidil in a yield of 63%, but the purity is not disclosed.patcit 1: Japanese Patent Application
Laid-Open No. 50-12186 patcit 2: Japanese Patent Application Laid-Open No.
2013-23467 patcit 3: Indian Patent Application 466 / CHE / 2011
patcit 4: Indian Patent Application 2071 / DEL / 2012
Production
of Naftopidil Monohydrochloride Dihydrate The naftopidil monohydrochloride dihydrate according to the present invention is preferably prepared according to the following scheme.
[Chem. 2]

That is, it can be obtained by reacting 2-[(1-naphthyloxy) methyl] oxylane with 1- (2-methoxyphenyl) piperazine by adding a solvent such as toluene, and then adding / presenting hydrochloric acid. ..The present invention will be described in more detail with reference to the following examples. The reactions in the examples below, and the numbers given to the compounds, are as shown in the scheme below.
[Chem. 3]

Example 1
100 g of 1 -naphthol [1] was dissolved in chloromethyloxylan [2], and a sodium methoxide methanol solution was added dropwise. After completion of the reaction, the reaction was washed with water and the organic layer was concentrated to obtain 2-[(1-naphthyloxy) methyl] oxylan [3] (yield 89%). 
Example 2
A toluene solution of 1- (2-methoxyphenyl) piperazin [4] was added dropwise to a toluene solution of 5.0 g of 2-[(1-naphthyloxy) methyl] oxylan [3]. After completion of the reaction, the mixture was washed with water and cooled by adding hydrochloric acid. After the suspension is filtered off, it is dried and (2RS) -1- [4- (2-methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol. Hydrochloride dihydrate [5] was obtained (yield 95%). 
Example 3
A toluene solution of 1- (2-methoxyphenyl) piperazin [4] was added dropwise to a toluene solution of 5.0 g of 2-[(1-naphthyloxy) methyl] oxylan [3]. After completion of the reaction, the mixture was washed with water, methanol and hydrochloric acid were added to separate the liquids, and the mixture was cooled. After the suspension is filtered off, it is dried and (2RS) -1- [4- (2-methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol. Hydrochloride dihydrate [5] was obtained (yield 81%). 
Example 4
A toluene solution of 1- (2-methoxyphenyl) piperazin [4] was added dropwise to a toluene solution of 5.0 g of 2-[(1-naphthyloxy) methyl] oxylan [3]. After completion of the reaction, the mixture was washed with water, methanol and hydrochloric acid were added, and the mixture was cooled. After the suspension is filtered off, it is dried and (2RS) -1- [4- (2-methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol. Hydrochloride dihydrate [5] was obtained (yield 86%). 
Example 5
A toluene solution of 1- (2-methoxyphenyl) piperazin [4] was added dropwise to a toluene solution of 100 g of 2-[(1-naphthyloxy) methyl] oxylan [3]. After completion of the reaction, the mixture was washed with water, methanol and hydrochloric acid were added, and the mixture was cooled. After the suspension is filtered off, it is dried and (2RS) -1- [4- (2-methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol. Hydrochloride dihydrate [5] was obtained (yield 92%). 
Example 6
(2RS) -1- [4- (2-methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol monohydrochloride dihydrate [5 ] Toluene and sodium hydroxide aqueous solution were added to 7.0 g. The organic layer was washed with water and concentrated, and then metall and acetonitrile were added and cooled. After the suspension is filtered off, it is dried and (2RS) -1- [4- (2-methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol [ 6] was obtained (yield 82%, chemical purity 99.98%). 
Example 7
(2RS) -1- [4- (2-methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol monohydrochloride dihydrate [5 ] Toluene and an aqueous sodium hydroxide solution were added to 12.0 g. The organic layer was washed with water and concentrated, then metall was added and cooled. After the suspension is filtered off, it is dried and (2RS) -1- [4- (2-methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol [ 6] was obtained (yield 90%, chemical purity 99.99%). 
Example 8
(2RS) -1- [4- (2-Methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol monohydrochloride dihydrate [5 ] Toluene, methanol, and potassium hydroxide aqueous solution were added to 116 g. The organic layer was washed with water and concentrated, then 2-propanol was added and cooled. After the suspension is filtered off, it is dried and (2RS) -1- [4- (2-methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol [ 6] was obtained (yield 90%, chemical purity 99.98%). 
Comparative Example 1
A toluene solution of 1- (2-methoxyphenyl) piperazin [4] was added dropwise to a 10.0 g toluene solution of 2-[(1-naphthyloxy) methyl] oxylan [3]. After completion of the reaction, the mixture was washed with water and cooled. After the suspension is filtered off, it is dried and (2RS) -1- [4- (2-methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol [ 6] Crude crystals were obtained (yield 89%). 
Comparative Example 2
(2RS) -1- [4- (2-methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol [6] obtained in Comparative Example 1. Methoxyol and acetonitrile were added to 6.0 g of the crude crystals of the above, and the mixture was cooled. After the suspension is filtered off, it is dried and (2RS) -1- [4- (2-methoxyphenyl) piperazin-1-yl] -3- (naphthalene-1-yloxy) propan-2-ol [ 6] was obtained (yield 85%, chemical purity 99.96%). 
Naftopidil one identification hydrochloride dihydrate
(1) water and HCl content
mosquito – Le Fischer – water content value measured by the law was 7.3% to 7.5%. The amount of HCl measured by neutralization titration was 8.0% to 8.1%. Determined from these naftopidil: HCl: H 2 When calculating these molar ratios from O weight ratio of approximately 1: 1: 2. From this, it was judged that naftopidil monohydrochloride dihydrate was obtained.
(2) Powder X-ray Diffraction
The chart of the results of powder X-ray diffraction (Cu-Kα) of naftopidil monohydrochloride dihydrate was as shown in FIG. For reference, a chart of naftopidil is shown as FIG.
(3) Differential Thermal Analysis / Thermogravimetric Analysis
(TG / DTA) The chart of the results of differential thermal analysis / thermogravimetric analysis (TG / DTA) of naphthopidyl monohydrochloride dihydrate is as shown in FIG. rice field. Here, the measurement conditions were such that the heating rate was 5 ° C./min. For reference, a chart of naftopidil is shown as FIG. 
PAPERShivani; Journal of Organic Chemistry 2007, V72(10), P3713-3722 https://pubs.acs.org/doi/10.1021/jo062674j

References

  1. ^ Sakai H, Igawa T, Onita T, Furukawa M, Hakariya T, Hayashi M, Matsuya F, Shida Y, Nishimura N, Yogi Y, Tsurusaki T, Takehara K, Nomata K, Shiraishi K, Shono T, Aoki D, Kanetake H (2011). “Efficacy of naftopidil in patients with overactive bladder associated with benign prostatic hyperplasia: prospective randomized controlled study to compare differences in efficacy between morning and evening medication”. Hinyokika Kiyo57 (1): 7–13. PMID 21304253.
Clinical data
Trade namesertv
AHFS/Drugs.comInternational Drug Names
Routes of
administration
Oral
ATC codenone
Legal status
Legal statusIn general: ℞ (Prescription only)
Identifiers
showIUPAC name
CAS Number57149-07-2 
PubChem CID4418
ChemSpider4265 
UNIIR9PHW59SFN
CompTox Dashboard (EPA)DTXSID5045176 
ECHA InfoCard100.220.557 
Chemical and physical data
FormulaC24H28N2O3
Molar mass392.499 g·mol−1
3D model (JSmol)Interactive image
showSMILES
showInChI
  (verify)

/////////////////Naftopidil, KT 611, a-Adrenergic Blocker, Antihypertensive.

COC1=CC=CC=C1N2CCN(CC2)CC(COC3=CC=CC4=CC=CC=C43)O

wdt-13

NEW DRUG APPROVALS

ONE TIME

$10.00

SHR-0532


SHR-0532

CAS 2166329-09-3

C24 H26 N4 O5 . C4 H6 O6

2-Pyridinecarboxamide, 5-cyano-N-[1-[(2R)-2-(1,3-dihydro-4-methyl-1-oxo-5-isobenzofuranyl)-2-hydroxyethyl]-4-piperidinyl]-4-methoxy-, (2R,3R)-2,3-dihydroxybutanedioate (1:1)

str1

FREE FORM

1945997-37-4

C24 H26 N4 O5
450.49
2-Pyridinecarboxamide, 5-cyano-N-[1-[(2R)-2-(1,3-dihydro-4-methyl-1-oxo-5-isobenzofuranyl)-2-hydroxyethyl]-4-piperidinyl]-4-methoxy-

5-Cyano-N-[1-[(2R)-2-(1,3-dihydro-4-methyl-1-oxo-5-isobenzofuranyl)-2-hydroxyethyl]-4-piperidinyl]-4-methoxy-2-pyridinecarboxamide

KCNJ potassium channel-1 inhibitor, Hypertension; Renal insufficiency

  • Originator Jiangsu Hengrui Medicine Co.
  • Class Antihypertensives
  • Mechanism of Action Undefined mechanism
  • Preclinical Hypertension
  • 03 Jun 2019 Jiangsu Hengrui Medicine Co. plans a phase I trial for Hypertension (PO) in June 2019 (NCT03971929)
  • 26 Aug 2018 Jiangsu HengRui Medicine plans a phase I trial for Hypertension (In volunteers) (PO) in August 2018 (NCT03645278)

Jiangsu Hengrui Medicine is developing an oral tablet formulation of SHR-0532, a small molecule specific inhibitor of ROMK (renal outer medullary potassium channel), for use as a diuretic to treat hypertension and renal insufficiency inducing water and sodium retention. In January 2019 a phase trial was completed, and in June 2019, another phase I trial for mild hypertension was planned.

PATENT

WO2016091042

WO 2017211271

CN 108113988

PATENT

WO2019011200

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2019011200&redirectedID=true

Diuretics are widely recommended as first-line antihypertensive drugs in national hypertension guidelines for mild to moderate hypertension, especially in elderly hypertension or complicated heart failure.

Clinically, traditional diuretics have a risk of causing hypokalemia. ROMK antihypertensive diuretic development of new targets, as ROMK of inward rectifier K + channel (inwardly rectifying K channels, Kir) a family, belong Kir1 type, the maintenance of renal potassium ions play a crucial balance effect. In the rat kidney, there are at least three subtypes of ROMK channels: ROMK1, ROMK2, and ROMK3. Most of ROMK2 is distributed in the ascending limb of Henle (TALH); ROMK1 and ROMK3 are mainly expressed on the cortical collecting duct (CCD). Expressed in the TALH and ROMK of Na + / K + / 2Cl  transporter with regulating the secretion of potassium ions and sodium reabsorption, and expressed in the CCD ROMK of Na + / K + secretion was adjusted with potassium transporter. Therefore, blocking the ROMK site can be a good diuretic research direction by inhibiting the reabsorption of Na + by diuretic and reducing blood potassium and causing hypokalemia.

WO2016091042A1 (publication date 2016-06-16) discloses a class of extrarenal medulla secretory potassium channel (ROMK) inhibitors, chemical name (R)-5-cyano-N-(1-(2-hydroxy-2) a compound of (4-methyl-1-oxo-1,3-dihydroisobenzofuran-5-yl)ethyl)piperidin-4-yl)-4-methoxypyridinecarboxamide, relative In other ROMK inhibitors, the compound increases the polar group, lowers the ClogP, enhances the hERG selectivity and increases the safety based on the activity of the ROMK inhibitor, and its structure is as shown in the formula (A).
Example 1 of WO2016091042A1 discloses a preparation method of Compound A, which has a total of five steps of reaction, and the specific reaction is as follows:
The method has the problems of more reaction steps, small batch size, post-treatment method using thin layer chromatography purification, low yield, etc., wherein the yield of the second step reaction is 22.4%, and the yield of the product prepared in the last step is only 11.3. % is not conducive to industrial expansion of production, it is necessary to improve its preparation method.
Example 1. Preparation of (R)-4-methyl-5-(oxiran-2-yl)isobenzofuran-1(3H)-one
First step, preparation of compound of formula (h)
Sodium borohydride (57.8 g) was dissolved in tetrahydrofuran (2000 mL), argon-protected, cooled to 0 ° C, material i (130.0 g) was added portionwise, and stirred at 5-10 ° C for 1 hour, 5-10 ° C Add boron trifluoride diethyl ether (237 mL) dropwise, stir at room temperature for 4 hours, stop the reaction, add methanol (800 mL) to quench the reaction, stir, add 1N hydrochloric acid (1000 mL) solution, stir at 0-20 ° C for 1 hour, decompress The organic solvent was evaporated, and the residue was evaporated. mjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj Concentration gave the title product (95 g).
The second step, the preparation of the compound of formula (g)
The raw material h (120.0 g) and trifluoroacetic acid (64 mL) were dissolved in acetonitrile (1 L), stirred, and cooled to 0-5 ° C under ice bath, and solid N-bromosuccinimide (147.0 g) was added portionwise. The reaction temperature was controlled at 0-8 ° C. After the reaction was completed, the reaction was quenched by adding 200 mL of potassium carbonate aqueous solution (containing 66.0 g of potassium carbonate) under ice-cooling, and concentrated under reduced pressure, water (200 mL) and ethyl acetate (800 mL) ×1,400 mL×2), and the organic phase was combined with EtOAc EtOAc (EtOAc m. Drying gave 150.0 g of product.
The third step, the preparation of the compound of formula (f)
The cuprous cyanide (123.0 g) was added to N,N-dimethylformamide (500 mL), and the material g (150.0 g) was dissolved in N,N-dimethylformamide (250 mL), and added to the dropping funnel. Under an argon atmosphere, after heating to 140-150 ° C, the N,N-dimethylformamide solution of the raw material g was added dropwise, and the reaction was stirred at 145 ° C for 2 hours. After the reaction was completed, the temperature was lowered to 90-95 ° C, and the mixture was added dropwise. Ionized water (62 mL), reacted for 18 hours, stopped the reaction, and cooled to room temperature. The reaction solution was added to a mixed solvent of isopropyl acetate/methanol (V/V = 4:1, 1500 mL), stirred for 30 minutes, and padded with silica gel and silicon. The mixture was filtered with celite, and the filter cake was washed with isopropyl acetate/methanol (V/V = 4:1, 100 mL×3), and the filtrate was concentrated under reduced pressure. The residue was slowly added to deionized water (3 L) and stirred for 1 hour. Filtration, the filter cake was washed with ethanol (50 mL×3), and the filter cake was dried to give 133.0 g of crude product. The crude product was added to ethyl acetate/methanol (V/V=4:1, 2.0L) and heated to reflux. After filtration, the cake was washed with ethyl acetate /methanol (EtOAc/EtOAc (EtOAc)
The fourth step, the preparation of the compound of formula (e)
The starting material f (26.0 g) was dissolved in dichloromethane (520 mL), triethylamine (33 mL) was added, and the mixture was cooled to -5-0 ° C and added trifluoromethanesulfonic anhydride (29.2 mL), 0-10 After reacting at ° C for 2 hours, the reaction was stopped. Under ice-cooling conditions, water (250 mL) was added dropwise to the reaction mixture to quench the reaction, and the mixture was separated, and the aqueous phase was extracted with dichloromethane (100 mL×2). The sodium solution (300 mL) was washed with EtOAc EtOAc (mjjHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH After dissolving at 70 ° C, the supernatant liquid was separated, and the lower layer of the oil was dissolved in a mixed solution of petroleum ether and ethyl acetate (V/V = 5:1) (300 mL × 2), and the organic phases were combined and concentrated under reduced pressure. (41.0 g), EtOAc (EtOAc m.
The fifth step, the preparation of the compound of formula (d)
The starting material e (50.1 g) was dissolved in isopropanol (500 mL), and ethylene trifluoroborate (29.5 g) and 1,1′-bisdiphenylphosphinoferrocene palladium dichloride (1.25 g) were added. Further, triethylamine (71 mL) was added, and the reaction was refluxed for 1.5 hours under an argon atmosphere. The reaction was stopped, cooled to room temperature, filtered, and the filtrate was washed with ethyl acetate (20 mL×3), and the filtrate was concentrated and concentrated through silica gel column. The title product (29.0 g) was obtained (yield: ethyl acetate: petroleum ether = 1:5-1:3).
The sixth step, the preparation of the compound of formula (c)
Potassium ferricyanide (279.0 g) was added to the reaction flask, followed by potassium carbonate (116.0 g) and hydrogenated quinidine 1,4-(2,3-naphthyridinyl)diether ((DHQD) 2 PHAL , 1.1g) and potassium citrate dihydrate (103mg), add 2L of deionized water, stir for 30 minutes, add tert-butanol (1.5L) under argon atmosphere, stir for 15 minutes, 0-5 ° C raw material d ( 49.0g) was added in portions, stirred at 0-5 ° C for 4 hours, warmed to room temperature and stirred for 18 hours, the reaction was stopped, saturated sodium sulfite solution (800 mL) and ethyl acetate (1000 mL) were added, stirred until fully dissolved, layered, The aqueous layer was extracted with EtOAc (EtOAc (EtOAc) (EtOAc (EtOAc) The mixture was cooled to rt.
The seventh step, the preparation of the compound of formula (a)
The raw material c (54.0 g) was added to dichloromethane (600 mL), and the mixture was white turbid. Under argon atmosphere, b (46.9 g) was added, stirred at room temperature for 10 minutes, cooled to 0 ° C, and trimethylchlorosilane was added dropwise. (54.0g), stirring at 0 ° C for 30 minutes, the solution became clear, warmed to room temperature for 1 hour, then cooled to 0 ° C, added b (23.0g), raised to room temperature for 30 minutes, stop the reaction, the reaction solution Concentration under reduced pressure gave the crude title product which was used in the next step without purification.
The eighth step, the preparation of the compound of formula (VI)
The raw material a (69.6 g) was added to methanol (1000 mL), and potassium carbonate (90.0 g) was added, and the mixture was stirred at room temperature for 2 hours, the reaction was stopped, and the mixture was evaporated under reduced pressure. ethyl acetate (500 mL) and water (200 mL) The aqueous phase was extracted with EtOAc (EtOAc (EtOAc) (EtOAc) The title compound (35.0 g) was obtained in vacuo.
Example 2 Preparation of 5-cyano-4-methoxypyridinecarboxylic acid hydrochloride
First step, preparation of the compound of formula (p)
Raw material n (110.0g), o (150.0g), acetic anhydride (151.5g) was added to the reaction flask and refluxed for 4 hours, the reaction was stopped, concentrated under reduced pressure, and the obtained residue was controlled at a temperature of 0-10 ° C to add ammonia water and Water (V / V = 1:1, 600mL) mixed solution, when a large amount of solids were formed, add ice water (400mL), drip, stir for 30 minutes, adjust to pH 2-3 with concentrated hydrochloric acid, stir 30 After a minute, the mixture was filtered, and the filter cake was dried, and then filtered with anhydrous ethanol (500 mL) for 1 hour, filtered, filtered, washed with cold anhydrous ethanol (100 mL×3), and the filter cake was dried to give the title product (80.0 g) The yield was 59%.
The second step, the preparation of the compound of formula (q)
Sodium hydroxide (43.6 g) was added to water (800 mL) under ice bath, and the starting material p (79.8 g) was added portionwise to the above aqueous sodium hydroxide solution, the ice bath was removed, and the mixture was heated to reflux for 2 hours to terminate the reaction. The reaction solution was cooled to room temperature with ice water, 2M hydrochloric acid solution was added dropwise to adjust the pH to 2-3, stirred for 30 minutes, filtered, and the filter cake was washed with ice water (100 mL) and cold ethanol (100 mL), and the obtained solid was dried. The title product (71.2 g), yield 100%.
The third step, the preparation of the compound of formula (r)
The raw material q (70.3 g) was dissolved in phosphorus oxychloride (210 mL), stirred at 110 ° C for 2 hours under reflux, concentrated under reduced pressure to remove phosphorus oxychloride, and the residue was added to acetonitrile (350 mL). Add diisopropylethylamine (117.0 g), dilute the solution to a black suspension, add the suspension to the ammonia water (350 mL) under ice bath, drop the reaction for 30 minutes, ethyl acetate (500 mL × 3) Extraction, the organic phase was combined, washed with saturated sodium chloride (500 mL), dried over anhydrous sodium sulfate, filtered and evaporated. (44.7 g), yield 51%.
The fourth step, the preparation of the compound of formula (s)
The raw material r (44.3 g) was added to dichloromethane (440 mL) under an argon atmosphere, and the temperature was controlled to 0-5 ° C under ice-cooling, triethylamine (58.6 g) was added dropwise, and the mixture was stirred for 10 minutes. Trifluoroacetic anhydride (58.5g) was added dropwise, the addition was completed, and the reaction was carried out for 1 hour in an ice bath. The reaction was stopped, the pH of the reaction mixture was 7-8, and the reaction was quenched by adding water (400 mL), and the mixture was separated. The organic phase was extracted with EtOAc (EtOAc) (EtOAc) (HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH g), yield 91%.
The fifth step, the preparation of the compound of formula (t)
The raw material s (25.6 g) and cesium carbonate (49.2 g) were dissolved in N,N-dimethylformamide (260 mL), cooled to 0 ° C in an ice bath, and methanol (9.5 g) was added dropwise in an ice bath, 0 ° C After reacting for 6 hours, the mixture was stirred at 20-25 ° C for 12 hours, and the reaction was stopped. The reaction mixture was quenched with water (650 mL), and extracted with ethyl acetate (200 mL×3). The title compound (16.8 g) was obtained. The title compound (16.8 g) was obtained from EtOAc (EtOAc). The rate is 67%.
The sixth step, the preparation of the compound of formula (II-1)
Add t (22.0g), palladium acetate (1.46g), 1,3-bis(diphenylphosphino)propane (2.68g), triethylamine (36mL) to the mixed solution, pressurize with carbon monoxide to 10bar, heat up The reaction was stopped at 70 ° C for 18 hours, the reaction was stopped, the organic solvent was removed by concentration, the aqueous phase was added with saturated sodium chloride solution and dichloromethane (300 mL×3), and the organic phase was combined, decolorized by activated carbon, filtered, and the organic phase was adjusted to pH with concentrated hydrochloric acid. =1, a solid precipitated, and after adding 50 mL of isopropanol, the dichloromethane was concentrated to remove the product, which was filtered and dried to give a product (23.6 g).
Example 3, (R)-5-cyano-N-(1-(2-hydroxy-2-(4-methyl-1-oxo-1,3-dihydroisobenzofuran-5-yl) Preparation of ethyl)piperidin-4-yl)-4-methoxypyridinecarboxamide (formula (I))
First step, synthesis of intermediate (IV)
Into the reaction flask, 4.0 L of absolute ethanol was added, and (R)-4-methyl-5-(oxiran-2-yl)-benzoisofuran-1(3H)-one (274.8) was added under stirring. g), 4-Boc-aminopiperidine (341.2 g), heated to 65-70 ° C, stirred for 18-20 h, and the heating was stopped. Naturally cooled to 50-55 ° C, 8.0 L of n-hexane was added under stirring, stirred until the temperature naturally dropped to 20-25 ° C, a large amount of solids were precipitated, the temperature of the ice bath was lowered to 0-5 ° C, stirred, suction filtered, filter cake It was washed twice with n-hexane (250 ml × 2) and dried to give a solid (354.3 g).

The second step, the synthesis of intermediate (III-1)

5.2 L of ethyl acetate was placed in a glass bottle, and the temperature was lowered to 0 to 5 ° C under stirring. The stirring was stopped, hydrogen chloride gas (0.48 kg) was introduced, and the temperature of the reaction liquid was controlled to be lower than 5 ° C during the passage of hydrogen chloride. The above product (349.3 g) was added to the reaction mixture with slow stirring. After the addition, the reaction was stirred for 3-4 hours, and the reaction temperature was naturally raised to 20-25 ° C, and the stirring was stopped. After suction filtration, the filter cake was washed three times with ethyl acetate (1.0 L×3), and the filter cake was dried under vacuum at 40-45 ° C for 6-8 h to give a solid (322.8 g) in a yield of 99.3%; The ratio of hydrochloric acid was determined by silver nitrate titration to be 20.5%.

The third step, the synthesis of the compound of formula (I)

Into the reaction flask, 4.0 L of N, dimethylformamide was added, and the product of the above step (317.8 g), 5-cyano-4-methoxypyridinecarboxylate II-1 (205.9 g) was sequentially added with stirring. Triethylamine (528.2 g), 1-hydroxybenzotriazole (152.7 g), N,N-diisopropylcarbodiimide (142.6 g). After the addition, the argon gas was replaced three times, and the mixture was heated to 40-45 ° C to stir the reaction for 16-18 h. The heating was stopped, and the reaction liquid was poured into ice water (30 L), and stirred for 1 hour. After suction filtration, the filter cake was washed three times with purified water, dried, and then pulverized with anhydrous ethanol (3.0 L) at 20-25 ° C for 1 h. Filtering, drying 10-12h to obtain crude (290.4g), yield 73.7%, purity: 97.76%;
N,N-dimethylformamide (2.0 L) was added to the crude product (290.4 g) with stirring. The reaction solution was heated to 70-75 ° C, 20.3 g of activated carbon (7% w/w) was added, and the mixture was stirred for 1 h. Heat filtration, wash the filter residue with hot N,N-dimethylformamide (70-75 ° C, 200 mL), combine the filtrate, heat the filtrate to 70-75 ° C, add hot (65-70 ° C, 5 L) with stirring Anhydrous ethanol to the reaction liquid in the previous step, stirring and crystallization, until the temperature naturally drops to 20-25 ° C, the reaction bottle is transferred to an ice water bath and stirring for 1 h, suction filtration, the filter cake is washed with absolute ethanol, dried to obtain a solid 219.5 g, total yield 55.7%, purity: 99.69%.
1 H-NMR (400 MHz, DMSO-d 6 ) δ 8.88 (s, 1H), 8.75 (d, 1H), 7.77 (s, 1H), 7.71-7.69 (m, 2H), 5.43-5.40 (m, 2H), 5.35 (s, 1H), 5.08 (s, 1H), 4.09 (s, 3H), 3.78 (s, 1H), 2.95 (s, 3H), 2.38 (s, 1H), 2.27 (s, 3H) ), 2.25 (s, 2H), 1.72 (s, 4H).

PATENT

WO-2019109935

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2019109935&tab=FULLTEXT&maxRec=1000

Novel crystalline forms of a renal outer medullary potassium channel inhibitor and their salts, preferably Form III, for treating hypertension or heart failure.

Strengthening the salt reabsorption of the kidneys can trigger a risk of high blood pressure. On the contrary, inhibiting the reabsorption function of the kidney can promote the excretion of urine and play a diuretic and antihypertensive effect. Common diuretics are thiazide diuretics, as the first-line antihypertensive drugs in the United States, mainly acting on Na + -Cl transport carriers; Loop diuretics are more effective in patients with impaired renal function, mainly through Na + -K + -2Cl  Transport proteins play a role. But both diuretics cause hypokalemia (symptoms: weakness, fatigue, muscle cramps, constipation and heart rhythm problems such as arrhythmia), increasing the risk of cardiovascular disease morbidity and mortality.
The renal outer medullary potassium channel (ROMK) is also called inward-rectifying potassium channel 1.1 (Kir1.1). Ion channels may ROMK thick ascending limb segment (the TAL) conductance through apical membrane of renal medullary loop, and of Na + -K + -2Cl  cotransporter NKCC2 (responsible for transport of NaCl) synergy regulation of Na + reabsorption. The study found that ROMK is directly associated with the secretory pathway of the kidney, knocking out the ROMK gene, missing the 35-pS ion channel and other TAL K + ion channels of mouse TAL and CCD . Batter syndrome is an autosomal recessive hereditary disease characterized by massive loss of salt in the kidneys, hypokalemia, and low blood pressure. Paramyelocytic hyperplasia is mainly caused by mutation of ROMK or Na + -K + -2Cl  cotransporter, except that hypokalemia caused by rotaside cell hyperplasia caused by ROMK mutation is better than Na + -K + – Parathyroid cell hyperplasia induced by 2Cl  cotransporter mutations is greatly alleviated. In summary, suppressing the function of ROMK can effectively inhibit Na without causing hypokalemia. + -K + -2Cl  The salt reabsorption function of transporters promotes the excretion of urine and acts as a diuretic and antihypertensive agent .
WO2016091042A1 (Publication Date 2016.06.16) discloses an extrarenal medullary secretory potassium channel (ROMK) inhibitor having the chemical name (R)-5-cyano-N-(1-(2-hydroxy-2-() 4-methyl-1-carbonyl-1,3-dihydroisobenzofuran-5-yl)ethyl)piperidin-4-yl)-4-methoxypyridinecarboxamide relative to other ROMK inhibitors The compound increases the polar group, reduces the ClogP on the basis of maintaining the activity of the ROMK inhibitor, improves the selectivity of hERG, and increases the safety, and the structure is as shown in formula (II):
The crystal structure of the pharmaceutically active ingredient often affects the chemical and physical stability of the drug, and the difference in crystallization conditions and storage conditions may cause changes in the crystal structure of the compound, sometimes accompanied by the formation of other forms of crystal form. In general, amorphous pharmaceutical products have no regular crystal structure and often have other defects, such as poor product stability, difficulty in filtration, easy agglomeration, and poor fluidity. Therefore, it is necessary to improve various aspects of the compound of the formula (II).

/////////////SHR-0532, SHR0532, SHR 0532, Jiangsu Hengrui Medicine Co, phase I, Antihypertensives

COc1cc(ncc1C#N)C(=O)NC2CCN(CC2)C[C@H](O)c4ccc3C(=O)OCc3c4C

%d bloggers like this: