Chiral Phosphoric Acid Catalyzed Enantioselective Aza-Michael Addition of Aromatic Amines to Nitroolefins
作者:Lei YANG、Chungu XIA、Hanmin HUANG
DOI:10.1016/s1872-2067(10)60261-6
日期:2011.9
be an effective organocatalyst in the enantioselective aza-Michaeladdition of aromaticamines to nitroolefins giving the corresponding β-nitroamine products in good yields (65%-95%) with moderate to good enantiomeric excess (16%-70%). This study represents the first example of a chiral phosphoric acid catalyzed asymmetric aza-Michaeladdition reaction.
Highly Enantioselective Reduction of β-Amino Nitroolefins with a Simple N-Sulfinyl Urea as Bifunctional Catalyst
作者:Xiang-Wei Liu、Yan Yan、Yong-Qiang Wang、Chao Wang、Jian Sun
DOI:10.1002/chem.201201192
日期:2012.7.23
Simple but effective: A structurally simple N‐sulfinyl urea was found to be a highly efficient bifunctionalcatalyst, which allows for the development of a novel pathway for the construction of chiral β‐amino nitroalkanes through enantioselectivereduction of β‐amino nitroolefins by trichlorosilane. High yields and excellent enantioselectivities were obtained for a broad range of β‐arylamino nitroolefin