Visible-light-promoted synthesis of secondary and tertiary thiocarbamates from thiosulfonates and -substituted formamides.

A general visible-light-promoted metal-free synthesis of secondary and tertiary thiocarbamates starting from thiosulfonates and -substituted formamides is developed. By employing rhodamine B as a photocatalyst and -butyl hydroperoxide (TBHP) as an oxidant, a wide scope of thiocarbamates can be obtained through direct thiolation of acyl C-H bonds under irradiation of blue light at room temperature for 12 h.