Diastereoselective synthesis of 3,5-trans-(+)-(3R,5R)-3-carbomethoxycarbapenam from 3-hydroxypyridine: questioning the stereochemical assignment of the natural product
作者:Hideyuki Tanaka、Hideki Sakagami、Kunio Ogasawara
DOI:10.1016/s0040-4039(01)02073-1
日期:2002.1
An enantio- and diastereoselective synthesis of the methyl ester of 3,5-trans-(3R,5R)-carbapenam-3-carboxylic acid from 3-hydroxypyridine via (2R,5S)-trans-5-acetoxy-2-allylpiperidine has been achieved by employing the piperidine–pyrrolidine ring-contraction reaction as the key step. The synthesis indicates that the configuration of the naturally occurring 3,5-trans-carbapenam-3-carboxylic acid is
通过(2 R,5 S)-反式-5-乙酰氧基-由3-羟基吡啶合成3,5-反式-(3 R,5 R)-carbapenam-3-羧酸甲酯的对映体和非对映体选择性通过使用哌啶-吡咯烷环收缩反应作为关键步骤,可以实现2-烯丙基哌啶。合成表明,天然存在的3,5-反式-卡巴南3-羧酸的构型不是经过修饰的(3 S,5 S),而是最初分配的(3 R,5 R)构型。