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A one-pot, two-staged protocol has been developed for the synthesis of 3-bromoindenes from aryl alkynyl alcohols/sulfonamides and aldehydes. Bromotrimethylsilane (TMSBr) initiated a halo-Prins cyclization reaction to give 3-(bromomethylene)-tetrahydropyrans or -piperidines, which underwent ring-opening and Friedel-Crafts allylation to yield 3-bromoindenes in the presence of Brønsted acids.
- cascade reactions
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