Abstract
A practical, efficient, and environmentally benign intramolecular hydroamination of olefinic sulfonamides was carried out in fluorous biphase system (FBS) using commercially available heptadecafluorooctanesulfonic acid (C 8F 17SO 3H) as a catalyst and perfluorodecaline (C 10F 18, cis- and trans- mixture) as a fluorous solvent to produce the corresponding cyclic products in good yields. The Brønsted acid of C 8F 17SO 3H is easily recovered and recycled at least five times.
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