Chemoselective, Regioselective, and Enantioselective Allylations of NH2OH under Iridium Catalysis.

Abstract

The utilization of unprotected NH2OH, which is not only an oxygen nucleophile but also a nitrogen nucleophile, in iridium-catalyzed allylic substitution is realized under mild conditions. The chemoselectivity, stereoselectivity, and multiple allylation are controlled by adjusting the reaction conditions. This method produces the N-(1-allyl)hydroxylamines in good to high yields with high level of chemoselectivities, regioselectivities, and enantioselectivities. The application of allylated hydroxylamine (R)-3a in the synthesis of diallylated hydroxylamine 6 is achieved, along with an excellent diastereomeric ratio.