Rhodium-Catalyzed Enantioselective Conjugate Addition of Organoboronic Acids to α,β-Unsaturated Sulfones
作者:Pablo Mauleón、Juan C. Carretero
DOI:10.1021/ol048690p
日期:2004.9.1
[reaction: see text] A general method for the enantioselective catalytic conjugate addition to acyclic alpha,beta-unsaturated sulfones is described. Using metal-chelating alpha,beta-unsaturated pyridyl sulfones as substrates, the rhodium-catalyzed chiraphos-mediated addition of organoboric acids takes place in excellent yield and high enantioselectivity. The subsequent elimination of the pyridylsulfonyl
[反应:见正文]描述了将对映选择性催化共轭物加成至无环α,β-不饱和砜的一般方法。使用金属螯合的α,β-不饱和吡啶基砜作为底物,铑催化的甲硫磷介导的有机硼酸的加成反应具有极好的收率和高对映选择性。随后通过Julia-Kociensky烯烃消除吡啶基磺酰基为烯丙基取代的烯烃的对映选择性合成提供了一种新方法。