A facile synthesis of multi-functionalized benzothiazonine was achieved by rhodium-catalyzed denitrogenative annulation of 1-sulfonyl-1,2,3-triazole and thiochromone. In view of excellent atom economy, broad substrate scope and easily availability of starting...

A rhodium(II)-catalyzed [4 + 2] annulation of ester-tethered 1-sulfonyl-1,2,3-triazoles and hexahydro-1,3,5-triazines, which features a chemoselective 1,2-ester migration of α-imine rhodium carbene intermediates, has been developed. Most of the valuable 1,2,3,4-tetrahydropyrimidine derivatives were generated in good to excellent yields under mild conditions. Several important derivatization reactions have been performed.