Bifunctional chiral urea catalyzed highly enantioselective Michael addition of cyclic 1,3-dicarbonyl compounds to 2-enoylpyridines
作者:Nagaraju Molleti、Suresh Allu、Sumit K. Ray、Vinod K. Singh
DOI:10.1016/j.tetlet.2013.04.003
日期:2013.6
A highly efficient cinchona alkaloid based bifunctional urea catalyzed enantioselective conjugate addition of cyclic 1,3-dicarbonylcompounds to a range of β-substituted 2-enoylpyridines has been developed. Chiral 2,4-diaryl substituted 1,4-dihydropyridines could easily be accessible from these Michael adducts. Significantly, this asymmetric methodology could afford both enantiomers of the products