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Treatment of N-(2-iodophenyl)-N-2-propynyl-p-tolylsulfonamide with various organozinc chlorides in the presence of palladium acetate, triphenylphosphine, and 1 equiv. of triethylamine in tetrahydrofuran gives (Z)-3-alkylidene-2,3-dihydroindoles via intramolecular Heck-type reaction and successive cross coupling reactions
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Luo et al. (1991) studied this question.
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