On pyrrolidine derivatives I. An efficient synthesis of 3-substituted (2<i>S</i>,5<i>S</i>)-pyrrolidine-2, 5-dicarboxylic acids
作者:Tsunetoshi Honma、Yukio Tada、Ikuo Adachi、Kikuo Igarashi
DOI:10.1002/jhet.5570260322
日期:1989.5
(2S,5S)-3-Alkylpyrrolidine-2, 5-dicarboxylic acid derivatives I were stereoselectively synthesized by means of an efficient method starting from L-aspartic acid (1). Dieckmann reaction of 4-benzyl 1-t-butyl N-t-butyl-oxycarbonyl-N-ethoxycarbonylmethyl-L-aspartate (4) provided product 5 which consisted of a mixture of (2S,5S)- and (2R,5S)-1-t-butyloxycarbonyl-3-oxopyrrolidine-2, 5-dicarboxylates in
通过有效的方法,从L-天冬氨酸(1)开始立体选择性地合成了(2S,5S)-3-烷基吡咯烷-2,5-二羧酸衍生物I。的4-苄基-1-迪克曼反应吨丁基Nt个丁基氧基羰基ñ -乙氧基羰基-L-天门冬氨酸(4)所提供的产品5,其由(2的混合物的小号,5小号) -和(2 - [R,5 S)-1-叔丁基氧羰基-3-氧吡咯烷-2,5-二羧酸酯的比例为95∶5。处理1-叔丁基6-乙基2-L-(叔丁基氧羰基)anuno-5-diazo-4-oxoadipate(8),从1制备,与乙酸铑(II)二聚体也提供了5的良好收率。的Wittig反应5,接着通过催化氢化,然后脱保护,提供化合物予。