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ORGANIC SPECTROSCOPY

Read all about Organic Spectroscopy on ORGANIC SPECTROSCOPY INTERNATIONAL 

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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 PHARMACEUTICALS 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 year tenure till date Dec 2017, 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, 50 Lakh plus views on dozen plus blogs, 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 19 lakh plus views on New Drug Approvals Blog in 216 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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GST-HG-121


GST-HG-121

mw 431.4

C23 H29 N07

Fujian Cosunter Pharmaceutical Co Ltd

Preclinical for the treatment of hepatitis B virus infection

This compound was originally claimed in WO2018214875 , and may provide the structure of GST-HG-121 , an HBsAg inhibitor which is being investigated by Fujian Cosunter for the treatment of hepatitis B virus infection; in June 2019, an IND application was planned in the US and clinical trials of the combination therapies were expected in 2020. Fujian Cosunter is also investigating GST-HG-131 , another HBsAg secretion inhibitor, although this appears to be being developed only as a part of drug combination.

WO2017013046A1

PATENT

WO2018214875

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2018214875&_cid=P21-KB0QYA-12917-1

Example 6

 

 

 

Step A: Maintaining at 0 degrees Celsius, lithium aluminum hydride (80.00 g, 2.11 mol, 2.77 equiv) was added to a solution of 6-1 (100.00 g, 762.36 mmol, 1.00 equiv) in tetrahydrofuran (400.00 mL). The solution was stirred at 10 degrees Celsius for 10 hours. Then, 80.00 ml of water was added to the reaction solution with stirring, and 240.00 ml of 15% aqueous sodium hydroxide solution was added, and then 80.00 ml of water was added. The resulting suspension was stirred at 10 degrees Celsius for 20 minutes, and filtered to obtain a colorless clear liquid. Concentrate under reduced pressure to obtain compound 6-2.

 

1 H NMR (400 MHz, deuterated chloroform) δ = 3.72 (dd, J = 3.9, 10.2 Hz, 1H), 3.21 (t, J = 10.2 Hz, 1H), 2.51 (dd, J = 3.9, 10.2 Hz, 1H ), 0.91(s, 9H)

 

Step B: Dissolve 6-2 (50.00 g, 426.66 mmol) and triethylamine (59.39 mL, 426.66 mmol) in dichloromethane (500.00 mL), di-tert-butyl dicarbonate (92.19 g, 422.40 mmol) Mol) was dissolved in dichloromethane (100.00 ml) and added dropwise to the previous reaction solution at 0 degrees Celsius. The reaction solution was then stirred at 25 degrees Celsius for 12 hours. The reaction solution was washed with saturated brine (600.00 mL), dried over anhydrous sodium sulfate, the organic phase was concentrated under reduced pressure and spin-dried, and then recrystallized with methyl tert-butyl ether/petroleum ether (50.00/100.00) to obtain compound 6-3 .
1 H NMR (400 MHz, deuterated chloroform) δ 4.64 (br s, 1H), 3.80-3.92 (m, 1H), 3.51 (br d, J = 7.09 Hz, 2H), 2.17 (br s, 1H), 1.48 (s, 9H), 0.96 (s, 9H).

 

Step C: Dissolve thionyl chloride (100.98 ml, 1.39 mmol) in acetonitrile (707.50 ml), 6-3 (121.00 g, 556.82 mmol) in acetonitrile (282.90 ml), and drop at minus 40 degrees Celsius After adding to the last reaction solution, pyridine (224.72 mL, 2.78 mol) was added to the reaction solution in one portion. The ice bath was removed, and the reaction solution was stirred at 5-10 degrees Celsius for 1 hour. After spin-drying the solvent under reduced pressure, ethyl acetate (800.00 ml) was added, and a solid precipitated, which was filtered, and the filtrate was concentrated under reduced pressure. Step 2: The obtained oil and water and ruthenium trichloride (12.55 g, 55.68 mmol) were dissolved in acetonitrile (153.80 ml), and sodium periodate (142.92 g, 668.19 mmol) was suspended in water (153.80 ml ), slowly add to the above reaction solution, and the final reaction mixture is stirred at 5-10 degrees Celsius for 0.15 hours. The reaction mixture was filtered to obtain a filtrate, which was extracted with ethyl acetate (800.00 mL×2). The organic phase was washed with saturated brine (800.00 mL), dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure to dryness. Column purification (silica, petroleum ether/ethyl acetate = 50/1 to 20/1) gave compound 6-4.

 

1 H NMR (400 MHz, deuterated chloroform) δ 4.49-4.55 (m, 1H), 4.40-4.44 (m, 1H), 4.10 (d, J = 6.15 Hz, 1H), 1.49 (s, 9H), 0.94 (s,9H).

[0230]
Step D: Dissolve 6-5 (100.00 g, 657.26 mmol) in acetonitrile (1300.00 mL), add potassium carbonate (227.10 g, 1.64 mol) and 1-bromo-3-methoxypropane (110.63 g, 722.99 Millimoles). The reaction solution was stirred at 85 degrees Celsius for 6 hours. The reaction solution was extracted with ethyl acetate 600.00 ml (200.00 ml×3), dried over anhydrous sodium sulfate, then filtered, and concentrated under reduced pressure to obtain compound 6-6.

[0231]
1 H NMR (400 MHz, deuterated chloroform) δ 9.76-9.94 (m, 1H), 7.42-7.48 (m, 2H), 6.98 (d, J=8.03 Hz, 1H), 4.18 (t, J=6.53 Hz , 2H), 3.95 (s, 3H), 3.57 (t, J = 6.09 Hz, 2H), 3.33-3.39 (m, 3H), 2.13 (quin, J = 6.34 Hz, 2H).

[0232]
Step E: Dissolve 6-6 (70.00 g, 312.15 mmol) in methylene chloride, add m-chloroperoxybenzoic acid (94.27 g, 437.01 mmol), and the reaction was stirred at 50 degrees Celsius for 2 hours. After cooling the reaction solution, it was filtered, the filtrate was extracted with dichloromethane, the organic phase was washed with saturated sodium bicarbonate solution 2000.00 ml (400.00 ml × 5), dried over anhydrous sodium sulfate, and concentrated under reduced pressure. A brown oil was obtained. After dissolving with as little methanol as possible, a solution of 2 mol per liter of potassium hydroxide (350.00 ml) was slowly added (exothermic). The dark colored reaction solution was stirred at room temperature for 20 minutes, and the reaction solution was adjusted to pH 5 with 37% hydrochloric acid. It was extracted with ethyl acetate 400.00 ml (200.00 ml×2), and the organic phase was washed with saturated brine 200.00 ml (100.00 ml×2), dried over anhydrous sodium sulfate, and concentrated under reduced pressure to obtain compound 6-7.

 

1 H NMR (400 MHz, deuterated chloroform) δ 6.75 (d, J = 8.53 Hz, 1H), 6.49 (d, J = 2.89 Hz, 1H), 6.36 (dd, J = 2.82, 8.60 Hz, 1H), 4.07 (t, J = 6.40 Hz, 2H), 3.82 (s, 3H), 3.60 (t, J = 6.15 Hz, 2H), 3.38 (s, 3H), 2.06-2.14 (m, 2H).

 

Step F: Dissolve 6-7 (33.00 g, 155.48 mmol) in tetrahydrofuran (330.00 mL), add paraformaldehyde (42.02 g, 466.45 mmol), magnesium chloride (29.61 g, 310.97 mmol), triethylamine (47.20 g, 466.45 mmol, 64.92 mL). The reaction solution was stirred at 80 degrees Celsius for 8 hours. After the reaction was completed, it was quenched with 2 molar hydrochloric acid solution (200.00 ml) at 25°C, then extracted with ethyl acetate 600.00 ml (200.00 ml×3), and the organic phase was washed with saturated brine 400.00 ml (200.00 ml×2). Dry over anhydrous sodium sulfate, filter and concentrate under reduced pressure to obtain a residue. The residue was washed with ethanol (30.00 ml) and filtered to obtain a filter cake. Thus, compound 6-8 is obtained.

 

1 H NMR (400 MHz, deuterated chloroform) δ 11.29 (s, 1H), 9.55-9.67 (m, 1H), 6.83 (s, 1H), 6.42 (s, 1H), 4.10 (t, J=6.48 Hz , 2H), 3.79 (s, 3H), 3.49 (t, J = 6.05 Hz, 2H), 3.28 (s, 3H), 2.06 (quin, J = 6.27 Hz, 2H)

 

Step G: Dissolve 6-8 (8.70 g, 36.21 mmol) in N,N-dimethylformamide (80.00 mL), add potassium carbonate (10.01 g, 72.42 mmol) and 6-4 (11.13 g) , 39.83 mmol), the reaction solution was stirred at 50 degrees Celsius for 2 hours. The reaction solution was quenched with 1.00 mol/L aqueous hydrochloric acid solution (200.00 mL), and extracted with ethyl acetate (150.00 mL×2). The combined organic phase was washed with water (150.00 mL×3), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to obtain compound 6-9.
1 H NMR (400 MHz, deuterated chloroform) δ 10.31 (s, 1H), 7.34 (s, 1H), 6.57 (s, 1H), 4.18-4.26 (m, 3H), 4.07 (dd, J=5.33, 9.60Hz, 1H), 3.88(s, 4H), 3.60(t, J=5.96Hz, 2H), 3.39(s, 3H), 2.17(quin, J=6.21Hz, 2H), 1.47(s, 9H) , 1.06 (s, 9H).

 

Step H: Dissolve 6-9 (15.80 g, 35.95 mmol) in dichloromethane (150.00 mL) and add trifluoroacetic acid (43.91 mL, 593.12 mmol). The reaction solution was stirred at 10 degrees Celsius for 3 hours. The reaction solution was concentrated under reduced pressure and spin-dried, sodium bicarbonate aqueous solution (100.00 mL) was added, and dichloromethane (100.00 mL) was extracted. The organic phase was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to obtain compound 6-10.
1 H NMR (400 MHz, deuterated chloroform) δ 8.40 (s, 1H), 6.80 (s, 1H), 6.51 (s, 1H), 4.30 (br d, J = 12.35 Hz, 1H), 4.04-4.11 ( m, 3H), 3.79 (s, 3H), 3.49 (t, J = 5.99 Hz, 2H), 3.36 (br d, J = 2.93 Hz, 1H), 3.28 (s, 3H), 2.06 (quin, J = 6.24Hz, 2H), 1.02(s, 9H).

 

Step I: Dissolve 6-10 (5.00 g, 15.56 mmol) in toluene (20.00 mL) and add 6-11 (8.04 g, 31.11 mmol). The reaction solution was stirred at 120 degrees Celsius for 12 hours under nitrogen protection. The reaction solution was quenched with water (100.00 mL), extracted with ethyl acetate (100.00 mL×2), the combined organic phases were washed with water (80.00 mL×2), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by reverse phase column. Then purified by high-performance liquid chromatography (column: Phenomenex luna C18 250*50 mm*10 microns; mobile phase: [water (0.225% formic acid)-acetonitrile]; elution gradient: 35%-70%, 25 minutes) Compound 6-12 is obtained.

 

1 H NMR (400 MHz, deuterated chloroform) δ 7.95 (s, 1H), 6.59 (s, 1H), 6.40 (s, 1H), 5.15-5.23 (m, 1H), 4.35-4.41 (m, 2H) , 4.08-4.19 (m, 2H), 3.94-4.00 (m, 2H), 3.72 (s, 3H), 3.61-3.67 (m, 1H), 3.46 (dt, J=1.96, 5.99Hz, 2H), 3.27 (s, 3H), 3.01-3.08 (m, 1H), 2.85-2.94 (m, 1H), 1.97-2.01 (m, 2H), 1.18-1.22 (m, 3H), 1.04 (s, 9H).

 

Step J: Dissolve 6-12 (875.00 mg, 1.90 mmol) in toluene (20.00 mL) and ethylene glycol dimethyl ether (20.00 mL), and add tetrachlorobenzoquinone (1.40 g, 5.69 mmol). The reaction solution was stirred at 120 degrees Celsius for 12 hours. The reaction solution was cooled to room temperature, and a saturated aqueous sodium carbonate solution (50.00 ml) and ethyl acetate (60.00 ml) were added. The mixed solution was stirred at 10-15 degrees Celsius for 20 minutes, and the liquid was separated to obtain an organic phase. Add 2.00 mol/L aqueous hydrochloric acid solution (60.00 mL) to the organic phase, stir at 10-15 degrees Celsius for 20 minutes, and separate the liquid. Wash the organic phase with 2 mol/L aqueous hydrochloric acid solution (60.00 mL×2), separate the liquid, and separate the water phase A 2 mol/L aqueous sodium hydroxide solution (200.00 ml) and dichloromethane (200.00 ml) were added. The layers were separated, and the organic phase was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to obtain compound 6-13.

[0243]
1 H NMR (400 MHz, deuterated chloroform) δ 7.98-8.78 (m, 1H), 6.86 (s, 1H), 6.43-6.73 (m, 2H), 4.41-4.48 (m, 1H), 4.28-4.38 ( m, 2H), 4.03-4.11 (m, 2H), 3.93 (br s, 1H), 3.80 (s, 3H), 3.47-3.52 (m, 3H), 3.29 (s, 3H), 2.06 (quin, J = 6.24 Hz, 2H), 1.33 (t, J = 7.15 Hz, 2H), 0.70-1.25 (m, 10H).

[0244]
Step K: Dissolve 6-13 (600.00 mg, 1.31 mmol) in methanol (6.00 mL), and add 4.00 mol/L aqueous sodium hydroxide solution (2.00 mL, 6.39 equiv). The reaction solution was stirred at 15 degrees Celsius for 0.25 hours. The reaction solution was adjusted to pH=3-4 with a 1.00 mol/L hydrochloric acid aqueous solution, and then extracted with dichloromethane (50.00 mL×3). The organic phases were combined, washed with saturated brine (50.00 mL), and dried over anhydrous sodium sulfate. , Filtered and concentrated under reduced pressure to obtain Example 6.

[0245]
ee value (enantiomeric excess): 100%.

[0246]
SFC (Supercritical Fluid Chromatography) method: Column: Chiralcel OD-3 100 mm x 4.6 mm ID, 3 μm mobile phase: methanol (0.05% diethylamine) in carbon dioxide from 5% to 40% Flow rate: 3 ml per minute Wavelength: 220 nm.

[0247]
1 H NMR (400 MHz, deuterated chloroform) δ 15.72 (br s, 1H), 8.32-8.93 (m, 1H), 6.60-6.93 (m, 2H), 6.51 (br s, 1H), 4.38-4.63 ( m, 2H), 4.11 (br dd, J = 4.52, 12.23 Hz, 3H), 3.79-3.87 (m, 3H), 3.46-3.54 (m, 2H), 3.29 (s, 3H), 2.07 (quin, J = 6.24 Hz, 2H), 0.77-1.21 (m, 9H).

PATENT

WO-2020103924

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2020103924&tab=FULLTEXT&_cid=P21-KB0QP8-09832-1

Novel crystalline forms of 11-oxo-7,11-dihydro-6H-benzo[f]pyrido[1,2-d][1,4]azepine, a hepatitis B surface antigen and HBV replication inhibitor, useful for treating HBV infection.

Hepatitis B virus, or hepatitis B for short, is a disease caused by Hepatitis B Virus (HBV) infection of the body. Hepatitis B virus is a hepatotropic virus, which mainly exists in liver cells and damages liver cells, causing inflammation, necrosis, and fibrosis of liver cells. There are two types of viral hepatitis, acute and chronic. Acute hepatitis B in most adults can heal itself through its own immune mechanism. But chronic hepatitis B (CHB) has become a great challenge for global health care, and it is also the main cause of chronic liver disease, cirrhosis and liver cancer (HCC). It is estimated that 2 billion people worldwide are infected with chronic hepatitis B virus, and more than 350 million people have developed into hepatitis B. Nearly 600,000 people die each year from complications of chronic hepatitis B. my country is a high incidence area of ​​hepatitis B. There are many patients with accumulated hepatitis B, and the harm is serious. According to data, there are about 93 million people with hepatitis B virus infection in China, and about 20 million of them are diagnosed with chronic hepatitis B, of which 10%-20% can evolve into cirrhosis and 1%-5% can develop into Liver cancer.

 

The key to the functional cure of hepatitis B is to remove HBsAg (hepatitis B virus surface antigen) and produce surface antibodies. HBsAg quantification is a very important biological indicator. In patients with chronic infection, few HBsAg reductions and seroconversion can be observed, which is the end point of current treatment.

 

The surface antigen protein of hepatitis B virus (HBV) plays a very important role in the process of HBV invading liver cells, and is of great significance for the prevention and treatment of HBV infection. Surface antigen proteins include large (L), medium (M) and small (S) surface antigen proteins, sharing a common C-terminal S region. They are expressed from an open reading frame, and their different lengths are determined by the three AUG start codons in the reading frame. These three surface antigen proteins include pre-S1/pre-S2/S, pre-S2/S and S domains. The HBV surface antigen protein is integrated into the endoplasmic reticulum (ER) membrane and is initiated by the N-terminal signal sequence. They not only constitute the basic structure of the virion, but also form spherical and filamentous subviral particles (SVPs, HBsAg), aggregated in the ER, host ER and pre-Golgi apparatus, SVP contains most S surface antigen proteins. The L protein is crucial in the interaction between viral morphogenesis and nucleocapsid, but it is not necessary for the formation of SVP. Due to their lack of nucleocapsid, the SVPs are non-infectious. SVPs are greatly involved in disease progression, especially the immune response to hepatitis B virus. In the blood of infected persons, the amount of SVPs is at least 10,000 times the number of viruses, trapping the immune system and weakening the body’s immune response to hepatitis B virus. HBsAg can also inhibit human innate immunity, can inhibit the production of cytokines induced by polysaccharide (LPS) and IL-2, inhibit the DC function of dendritic cells, and LPS interfere with ERK-1/2 and c-Jun N-terminal interfering kinase-1 2 Inducing activity in monocytes. It is worth noting that the disease progression of cirrhosis and hepatocellular carcinoma is also largely related to the persistent secretion of HBsAg. These findings indicate that HBsAg plays an important role in the development of chronic hepatitis.

 

The currently approved anti-HBV drugs are mainly immunomodulators (interferon-α and pegylated interferon-α-2α) and antiviral drugs (lamivudine, adefovir dipivoxil, entecavir, and Bifudine, Tenofovir, Kravudine, etc.). Among them, antiviral drugs belong to the class of nucleotide drugs, and their mechanism of action is to inhibit the synthesis of HBV DNA, and cannot directly reduce the level of HBsAg. As with prolonged treatment, nucleotide drugs show HBsAg clearance rate similar to natural observations.

 

Existing therapies in the clinic are not effective in reducing HBsAg. Therefore, the development of small molecule oral inhibitors that can effectively reduce HBsAg is urgently needed in clinical medicine.

 

Roche has developed a surface antigen inhibitor called RG7834 for the treatment of hepatitis B, and reported the drug efficacy of the compound in the model of woodchuck anti-hepatitis B: when using RG7834 as a single drug, it can reduce the surface of 2.57 Logs Antigen, reduced HBV-DNA by 1.7 Logs. The compound has good activity, but in the process of molecular synthesis, the isomers need to be resolved, which reduces the yield and increases the cost.

 

WO2017013046A1 discloses a series of 2-oxo-7,8-dihydro-6H-pyrido[2,1,a][2]benzodiazepine-3-for the treatment or prevention of hepatitis B virus infection Carboxylic acid derivatives. The IC 50 of Example 3, the highest activity of this series of fused ring compounds , is 419 nM, and there is much room for improvement in activity. The chiral centers contained in this series of compounds are difficult to synthesize asymmetrically. Generally, the 7-membered carbocyclic ring has poor water solubility and is prone to oxidative metabolism.
Example 1 Preparation of compound of formula (I)

 

[0060]

 

Step A: Maintaining at 0 degrees Celsius, to a solution of compound 1 (100.00 g, 762.36 mmol, 1.00 equiv) in tetrahydrofuran (400.00 mL) was added lithium aluminum hydride (80.00 g, 2.11 mol, 2.77 equiv). The solution was stirred at 10 degrees Celsius for 10 hours. Then, 80.00 ml of water was added to the reaction solution with stirring, and 240.00 ml of 15% aqueous sodium hydroxide solution was added, and then 80.00 ml of water was added. The resulting suspension was stirred at 10 degrees Celsius for 20 minutes, and filtered to obtain a colorless clear liquid. Concentrate under reduced pressure to obtain compound 2.
Step B: Dissolve compound 2 (50.00 g, 426.66 mmol) and triethylamine (59.39 mL, 426.66 mmol) in dichloromethane (500.00 mL), di-tert-butyl dicarbonate (92.19 g, 422.40 mmol) ) Was dissolved in dichloromethane (100.00 ml) and added dropwise to the previous reaction solution at 0 degrees Celsius. The reaction solution was then stirred at 25 degrees Celsius for 12 hours. The reaction solution was washed with saturated brine (600.00 ml), dried over anhydrous sodium sulfate, the organic phase was concentrated under reduced pressure and spin-dried, and then recrystallized from methyl tert-butyl ether/petroleum ether (50.00/100.00) to obtain compound 3.
Step C: Dissolve thionyl chloride (100.98 ml, 1.39 mmol) in acetonitrile (707.50 ml), compound 3 (121.00 g, 556.82 mmol) in acetonitrile (282.90 ml), and add dropwise at minus 40 degrees Celsius To the last reaction solution, after the dropwise addition, pyridine (224.72 mL, 2.78 mol) was added to the reaction solution in one portion. The ice bath was removed, and the reaction solution was stirred at 5-10 degrees Celsius for 1 hour. After spin-drying the solvent under reduced pressure, ethyl acetate (800.00 ml) was added, and a solid precipitated, which was filtered, and the filtrate was concentrated under reduced pressure. Step 2: The obtained oil and water and ruthenium trichloride (12.55 g, 55.68 mmol) were dissolved in acetonitrile (153.80 ml), and sodium periodate (142.92 g, 668.19 mmol) was suspended in water (153.80 ml ), slowly add to the above reaction solution, and the final reaction mixture is stirred at 5-10 degrees Celsius for 0.15 hours. The reaction mixture was filtered to obtain a filtrate, which was extracted with ethyl acetate (800.00 mL×2). The organic phase was washed with saturated brine (800.00 mL), dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure to dryness. Column purification (silica, petroleum ether/ethyl acetate = 50/1 to 20/1) gave compound 4.
Step D: Dissolve compound 5 (100.00 g, 657.26 mmol) in acetonitrile (1300.00 mL), add potassium carbonate (227.10 g, 1.64 mol) and 1-bromo-3-methoxypropane (110.63 g, 722.99 mmol) Mole). The reaction solution was stirred at 85 degrees Celsius for 6 hours. The reaction solution was extracted with ethyl acetate 600.00 ml (200.00 ml×3), dried over anhydrous sodium sulfate, then filtered, and concentrated under reduced pressure to obtain compound 6.

 

Step E: Compound 6 (70.00 g, 312.15 mmol) was dissolved in methylene chloride, m-chloroperoxybenzoic acid (94.27 g, 437.01 mmol) was added, and the reaction was stirred at 50 degrees Celsius for 2 hours. After cooling the reaction solution, it was filtered, the filtrate was extracted with dichloromethane, the organic phase was washed with saturated sodium bicarbonate solution 2000.00 ml (400.00 ml × 5), dried over anhydrous sodium sulfate, and concentrated under reduced pressure. A brown oil was obtained. After dissolving with as little methanol as possible, a solution of 2 mol per liter of potassium hydroxide (350.00 ml) was slowly added (exothermic). The dark colored reaction solution was stirred at room temperature for 20 minutes, and the reaction solution was adjusted to pH 5 with 37% hydrochloric acid. It was extracted with ethyl acetate 400.00 ml (200.00 ml×2), the organic phase was washed with saturated brine 200.00 ml (100.00 ml×2), dried over anhydrous sodium sulfate, and concentrated under reduced pressure to obtain compound 7.

[0066]
Step F: Compound 7 (33.00 g, 155.48 mmol) was dissolved in tetrahydrofuran (330.00 mL), paraformaldehyde (42.02 g, 466.45 mmol), magnesium chloride (29.61 g, 310.97 mmol), triethylamine ( 47.20 g, 466.45 mmol, 64.92 mL). The reaction solution was stirred at 80 degrees Celsius for 8 hours. After the reaction was completed, it was quenched with 2 molar hydrochloric acid solution (200.00 ml) at 25°C, then extracted with ethyl acetate 600.00 ml (200.00 ml×3), and the organic phase was washed with saturated brine 400.00 ml (200.00 ml×2). Dry over anhydrous sodium sulfate, filter and concentrate under reduced pressure to obtain a residue. The residue was washed with ethanol (30.00 ml) and filtered to obtain a filter cake. Thus, compound 8 is obtained.

 

Step G: Dissolve compound 8 (8.70 g, 36.21 mmol) in N,N-dimethylformamide (80.00 mL), add potassium carbonate (10.01 g, 72.42 mmol) and compound 4 (11.13 g, 39.83 Mmol), the reaction solution was stirred at 50 degrees Celsius for 2 hours. The reaction solution was quenched with 1.00 mol/L aqueous hydrochloric acid solution (200.00 mL), and extracted with ethyl acetate (150.00 mL×2). The combined organic phase was washed with water (150.00 mL×3), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to obtain compound 9.

Step H: Compound 9 (15.80 g, 35.95 mmol) was dissolved in dichloromethane (150.00 mL), and trifluoroacetic acid (43.91 mL, 593.12 mmol) was added. The reaction solution was stirred at 10 degrees Celsius for 3 hours. The reaction solution was concentrated under reduced pressure and spin-dried, sodium bicarbonate aqueous solution (100.00 mL) was added, and dichloromethane (100.00 mL) was extracted. The organic phase was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to obtain compound 10.

Step I: Compound 10 (5.00 g, 15.56 mmol) was dissolved in toluene (20.00 mL), and compound 11 (8.04 g, 31.11 mmol) was added. The reaction solution was stirred at 120°C for 12 hours under nitrogen protection. The reaction solution was quenched with water (100.00 mL), extracted with ethyl acetate (100.00 mL×2), the combined organic phases were washed with water (80.00 mL×2), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by reverse phase column. Purified by high-performance liquid chromatography (column: Phenomenex luna C18 250×50 mm×10 μm; mobile phase: [water (0.225% formic acid)-acetonitrile]; elution gradient: 35%-70%, 25 minutes) Compound 12 is obtained.

Step J: Compound 12 (875.00 mg, 1.90 mmol) was dissolved in toluene (20.00 mL) and ethylene glycol dimethyl ether (20.00 mL), and tetrachlorobenzoquinone (1.40 g, 5.69 mmol) was added. The reaction solution was stirred at 120 degrees Celsius for 12 hours. The reaction solution was cooled to room temperature, and a saturated aqueous sodium carbonate solution (50.00 ml) and ethyl acetate (60.00 ml) were added. The mixed solution was stirred at 10-15 degrees Celsius for 20 minutes, and the liquid was separated to obtain an organic phase. Add 2.00 mol/L aqueous hydrochloric acid solution (60.00 mL) to the organic phase, stir at 10-15 degrees Celsius for 20 minutes, and separate the liquid. Wash the organic phase with 2 mol/L aqueous hydrochloric acid solution (60.00 mL×2), separate the liquid, and separate the water phase A 2 mol/L aqueous sodium hydroxide solution (200.00 ml) and dichloromethane (200.00 ml) were added. The layers were separated, and the organic phase was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to obtain compound 13.

Step K: Compound 13 (600.00 mg, 1.31 mmol) was dissolved in methanol (6.00 mL), and 4.00 mol/L aqueous sodium hydroxide solution (2.00 mL, 6.39 equiv) was added. The reaction solution was stirred at 15 degrees Celsius for 0.25 hours. The reaction solution was adjusted to pH=3-4 with a 1.00 mol/L hydrochloric acid aqueous solution, and then extracted with dichloromethane (50.00 mL×3). The organic phases were combined, washed with saturated brine (50.00 mL), and dried over anhydrous sodium sulfate , Filtered and concentrated under reduced pressure to obtain the compound of formula (I). ee value (enantiomeric excess): 100%.

SFC (supercritical fluid chromatography) method:
Column: Chiralcel OD-3 100 mm x 4.6 mm size, 3 microns.
Mobile phase: methanol (0.05% diethylamine) in carbon dioxide, from 5% to 40%.
Flow rate: 3 ml per minute.
Wavelength: 220 nm.

////////////GST-HG-121, Fujian Cosunter,  Preclinical ,  hepatitis B,  virus infection

O=C(O)C1=CN2C(=CC1=O)c3cc(OC)c(OCCCOC)cc3OC[C@H]2C(C)(C)C

O=C(O)C1=CN2C(=CC1=O)c3cc(OC)c(OCCCOC)cc3OC[C@H]2C(C)(C)C

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