OPTICAL RESOLUTION OF SUBSTITUTED 2-(2-PYRIDINYLMETHYLSULPHINYL)-1H-BENZIMIDAZOLES
申请人:Parthasaradhi Reddy Bandi
公开号:US20120197021A1
公开(公告)日:2012-08-02
The present invention relates to process for preparation of optical resolution of substituted 2-(2-pyridinylmethylsulphinyl)-1H-benzimidazoles either as a single enantiomer or in an enantiomerically enriched form. Thus, for example, R-1,1′-binaphtyl-2-2′-diyl hydrogen phosphate was reacted with 2-[[[3-methyl-4-(2,2,2-trifluoro-ethoxy)-2-pyridinyl]methyl]sulfinyl]-1H-benzimidazole (Lansoprazole) in a mixture of benzene and cyclohexane to obtain diasteremeric complexes. The diasteremeric complexes were subjected to fractional crystallization to obtain R-2-[[[3-methyl-4-(2,2,2-trifluoro-ethoxy)-2-pyridinyl]methyl]sulfinyl]-1H-benzimidazole.R-1,1′-binaphthyl-2-2′-diyl hydrogen phosphate. The separated isomer was treated with sodium bicarbonate in a mixture of ethyl acetate and water to obtain R-2-[[[3-methyl-4-(2,2,2-trifluoro-ethoxy)-2-pyridinyl]methyl]sulfinyl]-1H-benzimidazole (dexlansoprazole).
本发明涉及制备取代2-(2-吡啶甲基磺酰基)-1H-苯并咪唑的光学分辨过程,可以制备单一对映异构体或对映富集形式。例如,将R-1,1'-联萘二苯基-2-2'-二酸二氢磷酸与2-[[[3-甲基-4-(2,2,2-三氟乙氧基)-2-吡啶基]甲基]磺酰基]-1H-苯并咪唑(兰索拉唑)在苯和环己烷混合物中反应,得到不对映异构体的配合物。将不对映异构体的配合物进行分馏结晶,得到R-2-[[[3-甲基-4-(2,2,2-三氟乙氧基)-2-吡啶基]甲基]磺酰基]-1H-苯并咪唑.R-1,1'-联萘二苯基-2-2'-二酸二氢磷酸。将分离的异构体在乙酸乙酯和水的混合物中用碳酸氢钠处理,得到R-2-[[[3-甲基-4-(2,2,2-三氟乙氧基)-2-吡啶基]甲基]磺酰基]-1H-苯并咪唑(左旋兰索拉唑)。