2,2,2-Trifluoro- and trichloroethyl imidates, which are easily prepared by reaction of a nitrile and a trihaloethanol in the presence of HCl, have proven to be excellent reagents for the preparation of amidines under mild reaction conditions. Depending on the nature of the amine nucleophile, the imidates can react either as the free-base or the hydrochloride salt in a telescoped process. In several
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.