Metal-free four-component coupling of cyclic diarylchloronium salts, tetrahydrothiophene, amines and carbon dioxide.

A four-component coupling reaction of cyclic diarylchloronium salts, tetrahydrothiophene, amines and CO2 has been reported for the first time under transition metal-free conditions, giving rise to a range of structurally diverse and useful sulfur-containing carbamates in high yields with excellent regioselectivities.