Catalytic asymmetric sulfimidation of 1,3-dithianes
Abstract
A direct catalytic sulfimidation of 1,3-dithianes to the corresponding chiral monosulfimides with N-(p-tolylsulfonyl)imino(phenyl)iodinane (TsNIPh) using a catalytic amount of copper(I) triflate (CuOTf) and a chiral 4,4′-disubstituted bis(oxazoline) as ligand has been developed. The reaction affords the chiral monosulfimides in good yield and with moderate enantioselectivity (up to 40% ee).