Highly Enantioselective Conjugate Addition of Malononitrile to 2-Enoylpyridines with Bifunctional Organocatalyst
作者:Nagaraju Molleti、Nirmal K. Rana、Vinod K. Singh
DOI:10.1021/ol3015607
日期:2012.9.7
An efficient enantioselective conjugate addition of malononitrile to a range of β-substituted 2-enoylpyridines catalyzed by cinchonaalkaloid-based bifunctional urea catalysts has been developed. Both enantiomers of the products could be achieved with the same level of enantioselectivity by using pseudoenantiomeric catalysts in up to 97% ee and in excellent yields. One of the enantioenriched products