Axially Chiral Guanidine as Highly Active and Enantioselective Catalyst for Electrophilic Amination of Unsymmetrically Substituted 1,3-Dicarbonyl Compounds
作者:Masahiro Terada、Megumi Nakano、Hitoshi Ube
DOI:10.1021/ja066808m
日期:2006.12.1
guanidine is found to function as an effective platform for asymmetric induction at the alpha-carbon of unsymmetrically substituted 1,3-dicarbonyl compounds. Highly efficient and enantioselective electrophilicamination of various 1,3-dicarbonyl compounds with azodicarboxylate was successfully achieved using the present chiral guanidine catalyst, which provides efficient access to the construction of
Enantioselective α-hydrazination of α-fluoro-β-ketoesters catalyzed by chiral nickel complexes
作者:Joo Yang Mang、Dae Gil Kwon、Dae Young Kim
DOI:10.1016/j.jfluchem.2008.11.001
日期:2009.2
The catalytic enantioselective electrophilic α-hydrazination promoted by chiral nickelcomplexes is described. Treatment of α-fluoro-β-ketoesters with azodicarboxylates as electrophilic amination reagents under mild reaction conditions afforded the corresponding α-amino α-fluoro-β-ketoesters with high yields (80–96%) and enantioselectivities (up to 78% ee).