Cu(II)-Mediated Methylthiolation of Aryl C-H Bonds with DMSO

An unprecedented Cu(II)-mediated methylthiolation of aryl C-H bonds under oxidative conditions that employs the widely available DMSO as the methylthiolation reagent is described. Various functional groups in the substrates were tolerated, and ethylthiolation was also successfully achieved directly from diethyl sulfoxide under the same reaction conditions.