A (2R,4S)-trans-disubstituted pyrrolidine ring system was constructed by employing iodine-mediated oxidative cyclization of (1R)-N-[1-(4-bromophenyl)-3-butenyl]acetamide 3 as a key step. The resulting diastereomeric mixture of (2R)-2-aryl-4-acetoxypyrrolidine 4 was stereoselectively converted to the side-chain of a novel ultra-broad-spectrum carbapenem 1, via (2R,4R)-2-aryl-4-hydroxypyrrolidine 7.
以(1R)-N-[1-(4-
溴苯基)-3-
丁烯基]乙酰胺3的
碘介导氧化环化为关键步骤,构建了(2R,4S)-反式-二取代
吡咯烷环体系。所得的(2R)-2-芳基-4-乙酰氧基
吡咯烷4的非对映异构体混合物通过(2R,4R)-2-芳基-
4-羟基
吡咯烷立体选择性地转化为新型超广谱碳青霉烯1的侧链7.