A concise method for the asymmetric β-vinylation of enals is presented. The success of the reaction lies in the stereoselective organocatalyzed addition of β-nitroethyl sulfone 1 to enals and in the ability of Mg to promote the concomitant elimi
Catalytic Asymmetric Synthesis of γ-Substituted Vinyl Sulfones
作者:Rosa López、Maitane Zalacain、Claudio Palomo
DOI:10.1002/chem.201003177
日期:2011.2.18
A fast new entry for the stereoselective construction of γ‐substituted vinyl sulfones is presented. The key for success is the use of a readily available chiral secondary amine catalyst that allows the use of base‐sensitive β‐nitroethyl sulfones as masked β‐sulfonyl vinyl anions in conjugateadditions. The method performed in a three‐step one‐pot operation gives access to a great variety of vinyl sulfones