Asymmetric Direct Vinylogous Michael Reaction Catalyzed by Self-Assembled Organocatalyst
作者:Wei-Yi Chen、Luo Ouyang、Rui-Ye Chen、Xin-Sheng Li
DOI:10.1080/00397911.2011.563023
日期:2012.9
Abstract The self-assembled organocatalyst of cinchonaalkaloidderivatives and amino acids has been applied to a direct asymmetric vinylogous Michael addition of α,α-dicyanoolefins to nitroolefins; the corresponding products could be obtained in moderate to good yields and enantioselectivities. GRAPHICAL ABSTRACT
provided a new organocatalytic strategy for the enantioselective addition of diphenylphosphine to a range of nitroalkenes, affording optically active beta-nitrophosphines (up to 99% ee after crystallization); this organocatalytic approach, providing a direct route to a new class of potentially useful enantiopure P,N-ligands, constitutes a bridge between the two complementary areas of asymmetric catalysis: