Abstract
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.
Key words
catalysis - palladium - Sonogashira reaction - furan - regioselectivity - fluorescence