A chiral thiourea catalyst possessing an amine function catalyzes an asymmetric [3+2] cycloaddition of azomethineylides to nitroolefins to provide highly functionalized pyrrolidines with high diastereo- and enantioselectivities (up to 98:1:1 dr, 92% ee). The reaction proceeds in a stepwise manner consisting of Michael addition and subsequent intramolecular aza-Henry reaction. Both reactions are promoted
Chiral phosphoric acid catalyzed 1,3-dipolar cycloadditions of aldehydes, diethyl α-aminomalonate, and nitroalkenes
作者:Wenqiang Luo、Yongjun Lin、Dengshan Yang、Long He
DOI:10.1016/j.tetasy.2014.04.006
日期:2014.5
A one-pot three component 1,3-dipolar cycloaddition reaction of an aldehyde, alpha-aminomalonate, and nitroalkene has been developed through binaphthol derived chiral phosphoric acids. This reaction represents one of the most enantioselective catalytic approaches to access structurally diverse pyrrolidine derivatives. (C) 2014 Elsevier Ltd. All rights reserved.
Reaction Control in the Organocatalytic Asymmetric One-Pot, Three-Component Reaction of Aldehydes, Diethyl α-Aminomalonate and Nitroalkenes: Toward Diversity-Oriented Synthesis