Asymmetric Michael Addition of γ,γ-Disubstituted α,β-Unsaturated Aldehydes to Nitroolefins via Dienamine Catalysis
作者:Bo Han、You-Cai Xiao、Zhao-Quan He、Ying-Chun Chen
DOI:10.1021/ol901939b
日期:2009.10.15
chemo- and α-regioselective asymmetric Michael addition of γ,γ-disubstituted α,β-unsaturated aldehydes to nitroolefins has been presented in excellent diastereo- and enantioselectivities (dr up to >99:1, 93−96% ee) via dienamine catalysis. The Michael adducts have been efficiently converted to a number of optically pure cyclic frameworks with versatile scaffold diversity.
γ,γ-二取代的α,β-不饱和醛向硝基烯烃的首次化学和α-区域选择性不对称迈克尔加成反应,具有出色的非对映和对映选择性(dr高达> 99:1、93-96%ee),二烯胺催化。迈克尔加合物已被有效地转化为多种具有通用支架多样性的光学纯环状骨架。