Ring round: 1-Acyl-1-alkynyl-cyclopropanes smoothly react with nucleophiles in the presence of a gold(I) catalyst to afford substituted furans in a fully atom-economical fashion (see scheme; Nu=nucleophile, Tf=trifluoromethanesulfonyl). The reaction tolerates a wide range of substrates.
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Zhang et al. (2006) studied this question.
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