Chiral framework: Chiral amines with pyrrolidine frameworks catalyze the enantioselective conjugate addition of a wide range of aldehydes to various vinyl sulfones and vinyl phosphonates in high yields and with enantioselectivities up to >99 % ee (see scheme). The high versatility of the Michael adducts is exemplified by various functionalizations with conservation of the optical purity.
The Organocatalytic Enantioselective Michael Addition of Aldehydes to Vinyl Sulfones in Water
作者:Teck-Peng Loh、Jian Xiao、Yan-Ling Liu
DOI:10.1055/s-0030-1258483
日期:2010.8
The first organocatalytic enantioselective Michael addition of aldehydes to vinyl sulfones in water was achieved using our rationally designed organocatalyst. The rigid nature of the tricycle with an inherent chiral pocket provides a well-organized chiral environment, which together with the hydrophobic pocket, enabled this elusive reaction to proceed smoothly in water.
Organocatalytic Michael Addition of Aldehydes to Vinyl Sulfones: Enantioselective α-Alkylations of Aldehydes and Their Derivatives
作者:Qiang Zhu、Yixin Lu
DOI:10.1021/ol8019296
日期:2008.11.6
Organocatalyticasymmetric Michael reaction of unmodified aldehydes to vinyl sulfones catalyzed by silylated biarylprolinol afforded the desired Michael products with exceptional enantioselectivity. The described enantioselective addition to vinyl sulfones, in combination with desulfonation, offers a unique, asymmetric entry to alpha-alkylated aldehydes and their derivatives.