[EN] A NOVEL STEREOSELECTIVE SYNTHESIS OF BENZIMIDAZOLE SULFOXIDES<br/>[FR] NOUVEAU PROCEDE DE SYNTHESE STEREOSELECTIVE DE SULFOXYDES DE BENZIMIDAZOLE
申请人:HETERO DRUGS LTD
公开号:WO2005116011A1
公开(公告)日:2005-12-08
The present invention relates to a process for stereoselective synthesis of substituted sulfoxides either as a single enantiomer or in an enantiomerically enriched form. Thus, 5-methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl)methyl]thio]-1H-benzimidazole is reacted with (R)-camphorsulfonyl chloride to form a mixture of 1-(R)-camphorsulfonyl-5-(and 6-)methoxy-2-[(3,5-dimethyl-4-methoxy-2-pyridyl)methylthio]-1H-benzimidazole, oxidized to obtain a diastereomeric excess of 1-(R)-camphorsulfonyl-(5- and 6-)-methoxy-2-[(3,5-dimethyl-4-methoxy-2-pyridyl)methyl-(S)-sulfinyl]-1H-benzimidazole over 1-(R)-camphorsulfonyl-(5- and 6-)-methoxy-2-[(3,5-dimethyl-4-methoxy-2-pyridyl)methyl-(R)-sulfinyl]-1H-benzimidazole, the diastereomers are separated by fractional crystallization and the separated 1-(R)-camphorsulfonyl-(5- and 6-)-methoxy-2-[(3,5-dimethyl-4-methoxy-2-pyridyl)methyl-(S)-sulfinyl]-1H-benzimidazole is deprotected to give esomeprazole.
本发明涉及一种对取代磺醚进行立体选择性合成的方法,可以得到单一对映体或对映富集形式的取代磺醚。因此,5-甲氧基-2-[[(4-甲氧基-3,5-二甲基-2-吡啶基)甲基]硫基]-1H-苯并咪唑与(R)-樟脑磺酰氯反应,形成1-(R)-樟脑磺酰基-5-(和6-)甲氧基-2-[(3,5-二甲基-4-甲氧基-2-吡啶基)甲基硫基]-1H-苯并咪唑的混合物,氧化以获得1-(R)-樟脑磺酰基-(5-和6-)甲氧基-2-[(3,5-二甲基-4-甲氧基-2-吡啶基)甲基-(S)-亚硫基]-1H-苯并咪唑的对映体过量,相对于1-(R)-樟脑磺酰基-(5-和6-)甲氧基-2-[(3,5-二甲基-4-甲氧基-2-吡啶基)甲基-(R)-亚硫基]-1H-苯并咪唑,这些对映体通过分级结晶分离,分离的1-(R)-樟脑磺酰基-(5-和6-)甲氧基-2-[(3,5-二甲基-4-甲氧基-2-吡啶基)甲基-(S)-亚硫基]-1H-苯并咪唑去保护得到埃索美拉唑。