Enantioselective Michael Reactions of β, β-Disubstituted Nitroalkenes: A New Approach to β^2,2-Amino Acids with Hetero-Quaternary Stereocenters

Abstract

An atom-economic organocatalytic asymmetric Michael reaction of alpha,beta,beta-trisubstituted olefins has been successfully developed. The reaction exhibits excellent enantioselectivities under low loading of catalysts, and the conjugate addition products are valuable for the synthesis of novel beta(2,2)-amino acids and beta-peptides.