Aza-Henry Reaction of Ketoimines
Catalyzed by Na<sub>2</sub>CO<sub>3</sub>: An Efficient Way to β-Nitroamines
作者:Xiaoming Feng、Liwei Wang、Cheng Tan、Xiaohua Liu
DOI:10.1055/s-2008-1077952
日期:——
A simple and efficient way to β-nitroamines via aza-Henry reaction of N-tosyl ketoimines and nitromethane has been developed. In the presence of only 5 mol% Na2CO3, most of the N-tosyl ketoimines can react to give products in good to excellent yields (up to 99%) in THF at room temperature.
The first example of catalytic enantioselective aza-Henry reaction of ketoimines has been realized using a simple chiral N,N'-dioxide-Cu(I) complex as catalyst. It performs well over a range of substrates to give the corresponding products in moderate to good yields (up to 83%) with high enantioselectivities (up to 96% ee).