标题：copper-catalyzed defluorinative thioannulation of trifluoropropynes for the synthesis of 1,2-dithiole-3-thiones
abstract: a simple and practical strategy for the preparation of 1,2-dithiole-3-thiones via coppercatalyzed defluorinative thioannulation of trifluoropropynes has been developed using elemental sulfur as the sole sulfur source. this reaction displays a wide substrate scope and high functional group tolerance to afford the corresponding sheterocycles in moderate to good yields and features efficient construction of multiple cs bonds through cf bond cleavage of cf3 groups.
