procedures for the catalytichydrosilylation of secondary and tertiary amides under mild conditions have been developed. In the presence of inexpensive zinc catalysts, tertiary amides are easily reduced by applying monosilanes. Key to success for the reduction of the secondary amides is the use of zinc triflate and disilanes with dual SiH moieties. The presented hydrosilylations proceed with excellent
Iridium-Catalyzed Reduction of Secondary Amides to Secondary Amines and Imines by Diethylsilane
作者:Chen Cheng、Maurice Brookhart
DOI:10.1021/ja304547s
日期:2012.7.18
Catalytic reduction of secondary amides to imines and secondary amines has been achieved using readily available iridium catalysts such as [Ir(COE)(2)Cl](2) with diethylsilane as reductant. The stepwise reduction to secondary amine proceeds through an imine intermediate that can be isolated when only 2 equiv of silane is used. This system requires low catalyst loading and shows high efficiency (up to 1000 turnovers at room temperature with 99% conversion have been attained) and an appreciable level of functional group tolerance.
Convenient preparations of azo-dye labeled amino acids and amines
作者:Alan Roy Katritzky、Qi-Yin Chen、Srinivasa Rao Tala
DOI:10.1039/b802846j
日期:——
N-(4-Arylazobenzoyl)-1H-benzotriazoles 3 react with aminoacids 4 and amines 6 to give azo-dye labeled aminoacids (5a-m) and amines (7a-n) in high yields (74-100%) with retention of chirality.