Asymmetric Direct Vinylogous Michael Addition to 2-Enoylpyridine <i>N</i>-Oxides Catalyzed by Bifunctional Thio-Urea
作者:Subhrajit Rout、Sumit K. Ray、Rajshekhar A. Unhale、Vinod K. Singh
DOI:10.1021/ol5025794
日期:2014.11.7
Catalytic enantioselectivedirectvinylogousMichaeladdition of α,α-dicyanoalkenes to 2-enoylpyridine N-oxides with a bifunctional organocatalyst is described. The methodology offers an efficient way to install an asymmetric carbon–carbon bond at the γ-position of α,α-dicyanoalkenes in excellent regio-, diastereo-, and enantioselectivity. Further, application in desymmetrization of achiral α,α-dicyanoalkene