WO2005054228A1 - A process for the preparation of substitited pyridinylmethylsulfinyl- benzimidazole enantiomers - Google Patents
A process for the preparation of substitited pyridinylmethylsulfinyl- benzimidazole enantiomers Download PDFInfo
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- WO2005054228A1 WO2005054228A1 PCT/IN2003/000384 IN0300384W WO2005054228A1 WO 2005054228 A1 WO2005054228 A1 WO 2005054228A1 IN 0300384 W IN0300384 W IN 0300384W WO 2005054228 A1 WO2005054228 A1 WO 2005054228A1
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- process according
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- titanium
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
- C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
- C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
Definitions
- the present invention relates to an enantioselective process for preparing substituted benzimidazoles either as a single enantiomer or in an enantiomerically enriched form and novel intermediates useful for preparing the substituted benzimidazoles.
- Substiituted 2-((4-alkoxy-2-pyhdinyl)methylsulfinyl)-1 H-benzimidazoles such as for example omeprazole, pantoprazole, lansoprazole and rabeprazole including their stereioisomers are inhibitors of gastric acid secretion.
- Omeprazole, chemically 5-methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl) methyl]sulfinyl]-1 H-benzimidazole is for instant disclosed in EP 124496. These compounds and structurally related compounds have a stereogenic center at sulfur and therefore exist as two optical isomers.
- the present invention provides a novel process for preparing a sulfoxide of formula I either as a single enantiomer or in an enantiomerically enriched form:
- R-i and R 2 are same or different and selected from hydrogen, alkyl, alkylthio, alkoxy optionally substituted by fluorine, alkoxyalkoxy, dialkylamino, phenylalkyl and phenylalkoxy;
- R 3 is alkyl optionally substituted by fluorine, alkoxyalkyl and phenylalkyl;
- Y is O or S and R .
- R5, e and R 7 are same or different and selected from hydrogen, alkyl, alkoxy, halogen, haloalkoxy, alkylcarbonyl, alkoxycarbonyl, oxazolyl and trifluoroalkyl; which process cornprises the steps of: a) an asymmetric oxidation in an organic solvent of a prochiral sulfide of the formula II
- R-i, R 2 , R 4 , R 5 , R 6 and R 7 are as defined above and R' 3 is halo or nitro with an oxidizing agent and a chiral titanium complex; and b) reaction of the compound obtained either as a single enantiomer or in an enantiomerically enriched form in the step (a) of formula III:
- R 1( R 2 , R 3 ⁇ R 4 , R 5 , R 6 and R 7 are as define for formula II; with a compound of formula IV:
- sulfoxides prepared by the novel method are sulfoxides of formula la to If either as a single enantiomer or in an enantiomerically enriched form:
- the compounds defined by the above formulas I, la to If may be converted to pharmaceutically acceptable salts thereof by conventional methods.
- the preferred compounds of the formula III are the compounds of the formula Ilia to lllf either as a single isomer or in an enantiomerically enriched form:
- step (a) can be carried out by mixing chiral titanium complex with the prochiral sulfide.
- the enantioselective oxidation can also be carried out by preparing chiral titanium complex in the presence of prochiral sulfide. The oxidation gives the product of the formula III in enantiomeric excess
- asymmetric oxidation is carried out in an organic solvent.
- suitable solvents are carboxylates such as ethyl acetate, methyl acetate, isopropyl acetate, tert-butyl methyl acetate and ethyl formate; alcohols such as methanol, ethanol and isopropyl alcohol; acetonitrile; tetrahydrofuran; dimethylformamide; dimethylsulfoxide; dioxane; aromatic hydrocarbons such as benzene, toluene, xylene, etc.; halogenated hydrocarbons such as methylene dichloride, chloroform, carbontetrachloride, ethylene dichloride, etc.; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone etc.
- a mixture of the solvents may also be used.
- Preferred organic solvents are ethyl acetate, tetra hydrofuran, toluene, methyl ethyl ketone, methyl isobutyl ketone, methylene dichloride, tert-butyl methyl ether and diethyl carbonate.
- the titanium complex is prepared from a chiral ligand and a titanium IV compound such as titanium (IV) alkoxide.
- Preferable titanium (IV) alkoxide is titanium (IV) isopropoxide or titanium (IV) propoxide.
- the amount of titanium complex is not critical. An amount of about 0.02 to 10.00 equivalents may be used, 0.1 to 5.0 equivalents being more preferable.
- the titanium complex can also be prepared by reaction of titanium tetrachloride with a chiral ligand in the presence of a base.
- An oxidizing agent suitable for the asymmetric oxidation is preferably a hydroperoxide such as tert-butylhydroperoxide or cumene hydroperoxide.
- the chiral ligand used in the preparation of the titanium complex is preferably a chiral alcohol such as esters of tartaric acids. More preferable esters are (-)-diethyl D-tartrate and (+)-diethyl L-tartrate.
- the oxidation is preferably carried out in the presence of a base.
- the preferable bases are alkyl amines such as triethylamine, diisopropylethylamine, pyridine, morpholine and N-methyl morpholine.
- the oxidation may also be carried out in the presence of water along with the organic solvent.
- the compounds of the formula III can be isolated from the reaction mixture conveniently as solids and can be used in the next step. The reaction mixture can also be used directly in the next step.
- the reaction of the compound of formula III with the compound of formula IV is carried out in a solvent or a mixture of solvents.
- Preferred solvents are carboxylates such as ethyl acetate, methyl acetate, isopropyl acetate, tert-butyl methyl acetate and ethyl formate; alcohols such as methanol, ethanol and isopropyl alcohol; acetonitrile; tetrahydrofuran; dimethylformamide; dimethylsulfoxide; dioxane; aromatic hydrocarbons such as benzene, toluene, xylene, etc.; halogenated hydrocarbons such as methylene dichloride, chloroform, carbontetrachloride, ethylene dichloride, etc.; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone etc.; ethers such as tert-butyl methyl ether, diethyl ether; and diethyl carbonate.
- carboxylates such as ethyl acetate, methyl
- a mixture of the solvents may also be used. More preferable organic solvents are ethyl acetate, tetrahydrofuran, toluene, methyl ethyl ketone, methyl isobutyl ketone, methylene dichloride, tert-butyl methyl ether and diethyl carbonate. No racemization is found to occur during the substitution reaction.
- Compounds of formula IV wherein M is sodium or potassium is preferred.
- the substitution reaction is carried out below the boiling temperature of the solvent/solvents used, preferably at about -40°C to boiling temperature of the solvents and more preferably at about 0 to 40°C.
- the quantity of the compound of the formula IV is not critical, but atleast 1 equivalent of the compound of the formula IV is required for better yield.
- the starting compounds of the formula II and IV are known or can be obtained from known processes.
- Example 1 5-Methoxy-2-[[(3,5-dimethyl-4-nitro-2-pyridinyl)methyl]thio]-1H- benzimidazole (25 gm), ethyl acetate (250 ml) and water (0.5 ml) are mixed and the contents are heated to 35°C.
- (-)-Diethyl D-tartrate (22.7 gm) and titanium isopropoxide (20.45 gm) are added, the contents are stirred for 1 hour at 35°C and cool to 25°C.
- N,N-Diisopropyl ethylamine (11.7 gm) is added to the reaction mass and to the clear solution formed cumene hydroperoxide (26.5 gm) is added slowly to the solution at 25°C in 15 minutes.
- the reaction mass is heated to 35°C and maintained for 12 hours.
- Isooctane (20 ml) is added to the reaction mass and extracted with 12% ammonia solution (200 ml) and adjusted the pH of the aqueous layer to 7 to 7.5 with acetic acid at 20°C. Then extract the aqueous solution with ethyl acetate (250 ml), dried and distilled off ethyl acetate.
- Example 2 (S)-5-Methoxy-2-[[(3,5-dimethyl-4-nitro-2-pyridinyl)methyl]sulfinyl]-1H- benzimidazole (ee: 95%, 10 gm) is mixed with methanol (100 ml) and the contents are cooled to 10°C. Sodium methoxide solution (20 ml, 30% in methanol) is added and heated to 50°C. The contents are maintained at this temperature for 3 hours, cooled to 25°C and water (100 ml) is added. The pH of the reaction mass is adjusted to 8.0 with acetic acid.
- reaction mass is extracted with methylene dichloride (100 ml), the layers are separated and the methylene dichloride layer is washed with water (100 ml). Methylene dichloride layer is dried with sodium sulfate, methylene dichloride solvent is distilled off to obtain (S)-5-Methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl)methyl]sulfinyl]-1H- benzimidazole as residue. The residue is dissolved in methanol (30 ml), cooled to 10°C and then potassium hydroxide (1.5 gm) in methanol (10 ml) is added slowly for 15 minutes.
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- Plural Heterocyclic Compounds (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IN2003/000384 WO2005054228A1 (en) | 2003-12-05 | 2003-12-05 | A process for the preparation of substitited pyridinylmethylsulfinyl- benzimidazole enantiomers |
AU2003288703A AU2003288703A1 (en) | 2003-12-05 | 2003-12-05 | A process for the preparation of substitited pyridinylmethylsulfinyl- benzimidazole enantiomers |
Applications Claiming Priority (1)
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PCT/IN2003/000384 WO2005054228A1 (en) | 2003-12-05 | 2003-12-05 | A process for the preparation of substitited pyridinylmethylsulfinyl- benzimidazole enantiomers |
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WO2005054228A1 true WO2005054228A1 (en) | 2005-06-16 |
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PCT/IN2003/000384 WO2005054228A1 (en) | 2003-12-05 | 2003-12-05 | A process for the preparation of substitited pyridinylmethylsulfinyl- benzimidazole enantiomers |
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AU (1) | AU2003288703A1 (en) |
WO (1) | WO2005054228A1 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006034632A1 (en) * | 2004-09-30 | 2006-04-06 | Jiangsu Hansen Pharmaceutical Co., Ltd. | New prazole compound and the use thereof |
EP1801110A1 (en) | 2005-12-22 | 2007-06-27 | KRKA, tovarna zdravil, d.d., Novo mesto | Esomeprazole arginine salt |
WO2007088559A1 (en) * | 2006-02-01 | 2007-08-09 | Jubilant Organosys Limited | Process for producing substituted sulphoxides |
WO2009117489A1 (en) * | 2008-03-18 | 2009-09-24 | Dr. Reddy's Laboratories Ltd. | Dexlansoprazole process and polymorphs |
ITMI20082046A1 (en) * | 2008-11-18 | 2010-05-19 | Dipharma Francis Srl | PROCEDURE FOR THE PREPARATION OF DEXLANSOPRAZOL |
US8063074B2 (en) | 2006-05-04 | 2011-11-22 | Dr. Reddy's Laboratories Limited | Polymorphic forms of esomeprazole sodium |
EP2438057A2 (en) * | 2009-06-02 | 2012-04-11 | Sun Pharmaceutical Industries LTD | Process for preparing sulphoxide compounds |
US8314241B2 (en) | 2009-07-29 | 2012-11-20 | Dipharma Francis S.R.L. | Process for the preparation of crystalline dexlansoprazole |
US8697880B2 (en) | 2004-02-20 | 2014-04-15 | Astrazeneca Ab | Compounds useful for the synthesis of S- and R-omeprazole and a process for their preparation |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2023609A6 (en) * | 1990-11-29 | 1992-01-16 | Inke Sa | Process for obtaining 2-[[[3-methyl-4-(2,2,2- trifluoroethoxy)-2-pyridinyl]methyl]sulphinyl]-1H- benzimidazole |
ES2060541A1 (en) * | 1993-02-26 | 1994-11-16 | Vinas Lab | New procedure for the synthesis of a derivative of 2-(2- pyridylmethylsulphinyl)benzimidazole, and new intermediate products obtained therewith |
US5948789A (en) * | 1994-07-15 | 1999-09-07 | Astra Aktiebolag | Process for synthesis of substituted sulphoxides |
WO2001004109A1 (en) * | 1999-07-14 | 2001-01-18 | Quimica Sintetica, S.A. | Process for the production of 2-(2-pyridinylmethylsulphinyl)-1h-benzimidazoles |
WO2002028852A1 (en) * | 2000-10-02 | 2002-04-11 | Dinamite Dipharma | A process for the preparation of pantoprazole and intermediates therefor |
WO2003097606A1 (en) * | 2000-07-28 | 2003-11-27 | Herbex, Produtos Químicos, Sa | New method for the preparation of the anti-ulcer compounds omeprazole, lansoprazole and pantoprazole |
-
2003
- 2003-12-05 AU AU2003288703A patent/AU2003288703A1/en not_active Abandoned
- 2003-12-05 WO PCT/IN2003/000384 patent/WO2005054228A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2023609A6 (en) * | 1990-11-29 | 1992-01-16 | Inke Sa | Process for obtaining 2-[[[3-methyl-4-(2,2,2- trifluoroethoxy)-2-pyridinyl]methyl]sulphinyl]-1H- benzimidazole |
ES2060541A1 (en) * | 1993-02-26 | 1994-11-16 | Vinas Lab | New procedure for the synthesis of a derivative of 2-(2- pyridylmethylsulphinyl)benzimidazole, and new intermediate products obtained therewith |
US5948789A (en) * | 1994-07-15 | 1999-09-07 | Astra Aktiebolag | Process for synthesis of substituted sulphoxides |
WO2001004109A1 (en) * | 1999-07-14 | 2001-01-18 | Quimica Sintetica, S.A. | Process for the production of 2-(2-pyridinylmethylsulphinyl)-1h-benzimidazoles |
WO2003097606A1 (en) * | 2000-07-28 | 2003-11-27 | Herbex, Produtos Químicos, Sa | New method for the preparation of the anti-ulcer compounds omeprazole, lansoprazole and pantoprazole |
WO2002028852A1 (en) * | 2000-10-02 | 2002-04-11 | Dinamite Dipharma | A process for the preparation of pantoprazole and intermediates therefor |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8697880B2 (en) | 2004-02-20 | 2014-04-15 | Astrazeneca Ab | Compounds useful for the synthesis of S- and R-omeprazole and a process for their preparation |
WO2006034632A1 (en) * | 2004-09-30 | 2006-04-06 | Jiangsu Hansen Pharmaceutical Co., Ltd. | New prazole compound and the use thereof |
EP1801110A1 (en) | 2005-12-22 | 2007-06-27 | KRKA, tovarna zdravil, d.d., Novo mesto | Esomeprazole arginine salt |
WO2007088559A1 (en) * | 2006-02-01 | 2007-08-09 | Jubilant Organosys Limited | Process for producing substituted sulphoxides |
US8063074B2 (en) | 2006-05-04 | 2011-11-22 | Dr. Reddy's Laboratories Limited | Polymorphic forms of esomeprazole sodium |
WO2009117489A1 (en) * | 2008-03-18 | 2009-09-24 | Dr. Reddy's Laboratories Ltd. | Dexlansoprazole process and polymorphs |
ITMI20082046A1 (en) * | 2008-11-18 | 2010-05-19 | Dipharma Francis Srl | PROCEDURE FOR THE PREPARATION OF DEXLANSOPRAZOL |
US8198455B2 (en) | 2008-11-18 | 2012-06-12 | Dipharma Francis S.R.L. | Process for the preparation of dexlansoprazole |
EP2438057A2 (en) * | 2009-06-02 | 2012-04-11 | Sun Pharmaceutical Industries LTD | Process for preparing sulphoxide compounds |
EP2438057A4 (en) * | 2009-06-02 | 2013-12-25 | Sun Pharmaceutical Ind Ltd | Process for preparing sulphoxide compounds |
US8314241B2 (en) | 2009-07-29 | 2012-11-20 | Dipharma Francis S.R.L. | Process for the preparation of crystalline dexlansoprazole |
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AU2003288703A1 (en) | 2005-06-24 |
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