Asymmetric Synthesis of Chiral Pyrrolizine-Based Triheterocycles by Organocatalytic Cascade Aza-Michael-Aldol Reactions
作者:Hyo-Jun Lee、Chang-Woo Cho
DOI:10.1002/ejoc.201301260
日期:2014.1
were obtained by the organocatalytic asymmetric cascade aza-Michael–aldol reaction of α-branched α,β-unsaturated aldehydes with 2-(trifluoroacetyl)pyrroles. High enantioselectivities (90–95 % ee) and excellent diastereoselectivities (dr up to >20:1) were achieved by employing this synthetic strategy. The highly functionalized, trifluoromethyl-substituted cascade products have three consecutive stereogenic