Simple Chiral PyrrolidineâPyridine-Based Catalysts for Highly Enantioselective Michael Addition to Nitro Olefins
作者:Da-Zhen Xu、Sen Shi、Yongmei Wang
DOI:10.1002/ejoc.200900716
日期:2009.10
of chiral pyrrolidine–pyridine-based organocatalysts, available from commercially available starting materials, have been synthesized and shown to be very effective catalysts for the asymmetric Michael addition reactions of cyclic/acyclic/aromatic ketones and an aldehyde with nitro olefins, giving excellent yields (up to 99 %), diastereoselectivities (syn/anti = 99:1), and enantioselectivities (up
已经合成了一类新的手性吡咯烷-吡啶基有机催化剂,可从市售原料中获得,并被证明是非常有效的催化剂,用于环状/无环/芳香酮和醛与硝基烯烃的不对称迈克尔加成反应,得到出色的产率(高达 99%)、非对映选择性(syn/anti = 99:1)和对映选择性(高达 99%)。基于中间体的实验结果和ESI-MS分析,推导出了有机催化剂与底物的活性模式。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)