A Highly Efficient, Ligand‐Free, and Recyclable Cu2S‐Catalyzed Coupling of Aryl Iodides with Diaryl Disulfides
A highly efficient and ligand-free copper(I) sulfide catalyzed cross-coupling reaction of aryl iodides with diaryl disulfides was developed. With only 1 mol-% of Cu 2 S as the catalyst, iron powder as the reductant, and K 2 CO 3 as the base, aryl iodides reacted with disulfides in DMSO at 90-110°C for 18-24 h under an atmosphere of argon to give the corresponding aryl sulfides in good to excellent yields. In addition, the catalyst is recyclable and reusable with some loss of activity.