Asymmetric synthesis of the cis- and trans-stereoisomers of 4-aminopyrrolidine-3-carboxylic acid and 4-aminotetrahydrofuran-3-carboxylic acid
作者:Mark E. Bunnage、Stephen G. Davies、Paul M. Roberts、Andrew D. Smith、Jonathan M. Withey
DOI:10.1039/b407558g
日期:——
successfully applied to the first asymmetric syntheses of cis-(3S,4R)- and trans-(3R,4R)-4-aminotetrahydrofuran-3-carboxylic acids (26% and 25% overall yield respectively, >98% d.e. and >97% e.e. in each case). Furthermore, the most efficient asymmetric synthesis to date of cis-(3R,4R)- and trans-(3R,4S)-4-aminopyrrolidine carboxylic acids is delineated: for cis-(3R,4R), four steps, >98% d.e., 52% overall yield;
锂(S)-N-苄基-N- [小α]-甲基苄基酰胺的非对映选择性共轭加成已成功应用于顺式-(3S,4R)-和反式-(3R,4R)-4的首次不对称合成中-氨基四氢呋喃-3-羧酸(总产率分别为26%和25%,ee分别> 98%和ee> 97%)。此外,描述了迄今为止最有效的不对称合成顺式(3R,4R)-和反式(3R,4S)-4-氨基吡咯烷羧酸:对于顺式(3R,4R),四个步骤,> 98% de,总收率52%;反式(3R,4S)的五个步骤,> 98%de,总收率50%。