Sequential Mannich-Aza-Michael Reactions for the Stereodivergent Synthesis of Highly Substituted Pyrrolidines
作者:Charlotte Enkisch、Christoph Schneider
DOI:10.1002/ejoc.200900787
日期:2009.11
A stereodivergent synthesis of 2,3,5-trisubstituted pyrrolidines by an organocatalytic Mannich/aza-Michael addition sequence has been developed. Depending upon the choice of the base used in the intramolecular aza-Michael additions, 2,5-trans- or 2,5-cis-configured pyrrolidines were obtained in high yields and excellent diastereomeric ratios. Selective deprotection of the amino group and the side-chain
已经开发了通过有机催化 Mannich/aza-Michael 加成序列立体发散合成 2,3,5-三取代的吡咯烷。根据分子内氮杂-迈克尔加成中所用碱的选择,2,5-反式或2,5-顺式构型的吡咯烷以高产率和优异的非对映体比率获得。氨基和侧链羟基的选择性脱保护在不损失非对映体纯度的情况下进行。关键 aza-Michael 反应的立体发散结果是热力学与动力学控制环化的结果。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)