Photocatalytic Synthesis of Thioesters from Thianthrenium Salts with Sodium Hydrosulfide

Abstract Sodium hydrosulfide (NaSH), as an inexpensive, weakly toxic, odorless, and atom-economical inorganic sulfur source, shows great potential for application in the synthesis of sulfur-containing compounds. Herein, we report a practical method for the preparation of sulfur ester compounds, using sodium hydrosulfide as the sulfur source and visible-light-induced catalysis of thianthrenium salts. The reaction proceeds through visible-light-driven EDA (electron donor–acceptor) complexation, with sodium hydrosulfide serving as the sulfur source and no transition metals involved. This method is characterized by mild reaction conditions, excellent functional group compatibility, and simple operation, thus providing a novel approach for the green and efficient synthesis of sulfur ester compounds.