Synthesis of thiophosphates through a three-component reaction by using sulfur dioxide as the sulfur source

Generation of thiophosphates through a three-component reaction of diaryliodonium tetrafluoroborates, 1,4-diazabicyclo[2.2.2]octane-sulfur dioxide (DABCO.(SO2)(2)), and diarylphosphine oxides under visible light irradiation is described. In this transformation, sulfur dioxide acts as the sulfur source, and reduction of arylsulfonyl radicals is the key step to fulfill the thiolation with diarylphosphine oxides.