Palladium-catalyzed cross-coupling reactions between benzyl, aryl, or allyl bromides and conjugated ene-yne-ketones lead to the formation of 2-alkenyl-substituted furans. This novel coupling reaction involves oxidative addition, alkyne activation-cyclization, palladium carbene migratoryinsertion, β-hydride elimination, and catalyst regeneration. Palladium (2-furyl)carbene is proposed as the key intermediate
Synthesis of hydronaphthalenes through coupling of enyne-carbonyl compounds that contain pendant alkane groups with Fischer carbene complexes
作者:Rajesh Kumar Patti、Shaofeng Duan、Alejandro Camacho-Davila、Kris Waynant、Kenneth A. Dunn、James W. Herndon
DOI:10.1016/j.tetlet.2010.05.049
日期:2010.7
The coupling of enyne-carbonyl compounds that contain pendantalkene groups with Fischer carbene complexes to afford furans that contain pendantalkene groups is described. Subsequent intramolecular Diels–Alder reactions are effective in selected cases, resulting in hydronaphthalene systems after dehydration. Although the Diels–Alder event is thermodynamically unfavorable, the overall transformation