Brønsted acid-catalyzed efficient Strecker reaction of ketones, amines and trimethylsilyl cyanide
作者:Guang-Wu Zhang、Dong-Hua Zheng、Jing Nie、Teng Wang、Jun-An Ma
DOI:10.1039/b924272d
日期:——
A general method for the one-pot, three-component Strecker reaction of ketones was developed using Brønsted acids as organocatalysts. A series of α-aminonitriles were obtained in good to excellent yields (79–99%). A preliminary extension to a catalytic enantioselective three-component Strecker reaction of ketones (up to 40% ee) is also described.
The directamination of cyanohydrins with amines via a catalytic cyano-borrowing reaction was developed. The transformation features broad substrate scope, excellent functional group compatibility, and very mild and simple operations. Moreover, a titanium catalyst supported by quinine and (S)-BINOL ligands enabled an asymmetric cyano-borrowing reaction with moderate to high enantioselectivity.