Expeditious trifluoromethylthiolation and trifluoromethylselenolation of alkynyl(phenyl) iodoniums by [XCF3]- (X = S, Se) anions

Trifluoromethylthiolation and trifluoromethylselenolation of alkynyl(phenyl) iodonium tosylates by [XCF3](-) (X = S, Se) ions was accomplished in 5-10 minutes at room temperature under a N-2 atmosphere and provided a variety of alkynyl trifluoromethyl sulfides and selenides in good yields. Compared to the known methods, this approach has several advantages such as short reaction times and metal-and additive-free conditions without needing excess [Me4N][XCF3] reagents. Moreover, the less efficient reactions of (phenylethynyl) benziodoxol(on) e with [Me4N][XCF3] under the standard conditions demonstrate that acyclic alkynyl(phenyl) iodoniums are more powerful alkynyl sources in the conversion. This protocol allows for a fast and convenient access to numerous alkynyl trifluoromethyl sulfides and selenides.