Cs2CO3-Promoted C(sp2)–N Formation of Dimethyl Thiocarbamate-Protected Indoles Using Tetramethylthiuram Monosulfide (TMTM)

An efficient and simple synthesis of 1-thiocarbamoylindoles is reported in which 1H-indoles react with tetramethylthiuram monosulfide (TMTM) to give a series of 1-thiocarbamoylindoles that were obtained- in good to excellent yields. The procedure was promoted by Cs(2)CO(3)under transition-metal-free conditions and gives a simple entry to protected indoles.