A New Complex of Palladium−Thiourea and Carbon Tetrabromide Catalyzed Carbonylative Annulation of o-Hydroxylarylacetylenes: Efficient New Synthetic Technology for the Synthesis of 2,3-Disubstituted Benzo[b]furans
摘要:
[GRAPHICS]A highly effective cocatalysis system (Pdl(2)-thiourea and CBr4) was developed for carbonylative cyclization of bath electron-rich and electron-deficient o-hydroxylarylacetylenes to the corresponding methyl benzo[b]furan-3-carboxylates.