Iridium-catalyzed asymmetric, complete hydrogenation of pyrimidinium salts under batch and flow

Abstract

A highly enantioselective method for the complete hydrogenation of pyrimidinium salts using Ir/(S,S)-f-Binaphane complex as the catalyst was presented in this study. This approach affords facile access to a range of fully saturated chiral hexahydropyrimidines, which are prevalent in many bioactive molecules. The reactions showcase high yields and enantioselectivities under mild reaction conditions without additives. Successful application of this methodology in a continuous flow fashion further broadened its practical utility.