Highly efficient synthesis of α-aminophosphonates catalyzed by hafnium(IV) chloride
作者:Xiao-Chuan Li、Shan-Shan Gong、De-Yun Zeng、Yue-Hai You、Qi Sun
DOI:10.1016/j.tetlet.2016.03.033
日期:2016.4
A highly efficientone-pot method for the synthesis of a variety of α-aminophosphonatesvia the one-pot three-component reaction of aldehyde, amine, and phosphite has been developed using only 2 mol % HfCl4 as the catalyst. The NMR evidence strongly indicated the catalytic roles of Hf(IV) on the activation of aldehyde, phosphite, and imine intermediate.
The first general method for the reductive phosphination of amides in one pot has been developed. The reactions described provide a novel access to alpha-amino phosphonates in good to excellent yields, cover a broad scope of substrates such as secondary and tertiary amides, and do not require a low temperature.