Visible-Light-Initiated Four-Component Reaction of α-Diazoesters, Cyclic Ethers, Elemental Sulfur, and Secondary Phosphines.

A visible-light-promoted four-component reaction of α-diazoesters, cyclic ethers, elemental sulfur, and secondary phosphines has been developed. This multicomponent reaction proceeded under mild conditions to afford a range of dithiophosphinates using elemental sulfur as the sulfur source. The present photochemical protocol offers a sustainable and practical strategy for dithiophosphinate synthesis without transition metals or complex operational procedures.