A Simple Organocatalytic Enantioselective Cyclopropanation of α,β-Unsaturated Aldehydes

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Abstract

A highly chemo- and enantioselective organocatalytic cyclopropanation of α,β-unsaturated aldehydes with bromomalonate and 2-bromoacetoacetate esters is presented. The reaction is catalyzed by chiral amines and gives access to 2-formylcyclopropanes in high yields and up to 99 % ee.

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