S‐(Trifluoromethyl)benzothioate (TFBT) has been developed as an inexpensive, bench‐stable, and user‐friendly trifluoromethylthiolation reagent, which can be easily synthesized by using KF as the only fluorine source. By using TFBT, trifluoromethylthiolates with various counterions can be readily obtained. The synthetic application of TFBT was demonstrated by trifluoromethylthiolation‐halogenation of arynes, bis(trifluoromethylthiolation)–halogenation of 1,2‐benzdiynes, nucleophilic substitution of alkyl halides, deoxytrifluoromethylthiolation of alcohols, and cross‐coupling with aryl and vinyl boronic acids.
1,1-Difluorinated sulfonamides are known to have improved anti-inflammatory activity and enzyme inhibitory potency than their non-fluorinated counterparts, where two geminal fluorine atoms can give rise to electronic perturbation of the nearby polar groups and improve their biological activity. However, as methods for their stereoselective synthesis are scarce, such entities remain entirely unexplored. Here, we outline an efficient method for stereoselective introduction of difluoro(aminosulfonyl)methyl group (CF 2 SO 2 NH 2 ) into carbonyls, imines, and alkyl halides with a new (R)-2-pyridyl difluoromethyl sulfoximine reagent, which provides an unique solution for synthesis of chiral ,-difluorinated sulfonamides with a quaternary stereocenter. Its potency is illustrated by the synthesis of fluorinated analogues of bioactive compounds such as 2-OH-SA, one of antagonists for GABA B receptor in guinea pig ileum, and the late-stage modification of complex molecules such as haloperidol, ebastine, cholesterol and (+)--tocopherol derivatives.Stereoselective difluoro(aminosulfinyl)methylation to yield chiral sulfinylamides are presented, showcasing other uses of this new reagent.
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