“…4 So the study on the methylthiolation of organic compounds has aroused great interest among organic chemists. Dimethyl sulfoxide (DMSO), a cheap and readily available solvent, has been used as a reagent in numerous transformations, such as oxidation, 5 methylation, 6 methylenation, 7 methylsulfonylation, 8 etc . It is well known that heterocyclic compounds are a significant part of organic and medicinal chemistry research and the industries.…”