The highly electrophilic fluorosulfoxonium cation [Ph2S(O)F]+[B(C6F5)4]− is shown to promote (n + 2) annulation on donor–acceptor (D–A) strained cycles. This study highlights new reactions catalysed by highly electrophilic sulfoxonium cations and the thin barrier between Lewis acid catalysis and Brønsted acid catalysis.
A. Manel, J. Berreur, F. R. Leroux and A. Panossian, Org. Chem. Front., 2021, 8, 5289 DOI: 10.1039/D1QO00840D
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