A novel route to an intermediate of vernakalant, (1R,2R)-2-[(R)-3-(benzyloxy)pyrrolidin-1-yl]cyclohexanol from ethyl (R)-4-chloro-3-hydroxybutanoate is described. It was found that the key intermediate (R)-4-(benzyloxy)-1-[(1R,2R)-2-(tert-butyldimethylsiloxy)cyclohexyl]pyrrolidin-2-one could be isolated with high diastereomeric excess (up to 99% de) from its isomer by column chromatography alone, without further chemical resolution.
描述了一种从乙基 (R)-4-
氯-3-hydroxybutanoate 合成 vernakalant 中间体 (1R,2R)-2-[(R)-3-(苄氧基)pyrrolidin-1-基]
环己醇的新路线。研究发现,关键中间体 (R)-4-(苄氧基)-1-[(1R,2R)-2-(叔丁基二甲基
硅氧基)环己基]
吡咯烷-2-酮可以通过柱色谱单独从其同分异构体中分离出来,且具有很高的二对映体过剩 (高达 99% de),无需进一步的
化学分离。