Sonogashira Reactions of 2,3,4,5-Tetrabromofuran: Synthesis of 2,3,4,5-Tetraalkynylfurans, 2,3,5-Trialkynylfurans and 2,5-Dialkynylfurans

[摘要]：2,3,4,5-Tetrabromofuran is transformed into a variety of alkynyl-substituted furans by regioselective Sonogashira cross-coupling reactions. In this context, the first 2,3,4,5-tetraalkynylfurans and 2,3,5-trialkynylfurans were prepared. 2,3,4,5-Tetraalkynylfurans and 2,5-dialkynyl-3,4-diarylfurans show interesting fluorescence properties.

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