Copper-Catalyzed Aerobic [3+2]-Annulation of <i>N</i>-Alkenyl Amidines
作者:Yi-Feng Wang、Xu Zhu、Shunsuke Chiba
DOI:10.1021/ja2120629
日期:2012.2.29
A method for the synthesis of bi- and tricyclic amidines has been developed through copper-catalyzed aerobic [3+2]-annulation reaction of N-alkenyl amidines. These cyclicamidines could be converted into mono-benzyl-protected vicinal diamines by the reduction with aluminum hydride.
A new cationic [N–O–S]zirconium complex (cat.) was developed to be an excellent catalyst for the intramolecular hydroamination of aminoalkenes with a large substrate scope from terminal alkenes to internal alkenes, and primary amines to secondary amines. The catalyst system can also tolerate various functional groups and perform sequential hydroamination of primary aminodienes.