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King of the ring: S-(trifluoromethyl)benzobthiophenium salts 1, as analogues of Yagupolskii–Umemoto type reagents, were synthesized by novel triflic acid catalyzed intramolecular cyclization of ortho-ethynylaryltrifluoromethylsulfanes 2. 1 j is especially useful for the electrophilic trifluoromethylation of β-ketoesters and dicyanoalkylidenes.
Matsnev et al. (Tue,) studied this question.
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