Light-Driven Reductive Cleavage of Sulfonamides Promoted by Thiourea Organophotosensitizers.

We have developed a practical method to perform the reductive photocleavage of sulfonamides using thioureas as organophotocatalysts. This transformation, which tolerates a variety of substrates, occurs under mild reaction conditions in the presence of tetrabutylammonium borohydride as a reducing agent. Experimental and theoretical mechanistic investigations complete the study, shedding light on the nature of the active species involved in the photocatalytic process.