Synthesis of Isocoumarins and α-Pyrones via Tandem Stille Reaction/Heterocyclization
作者:Khalil Cherry、Jean-Luc Parrain、Jérôme Thibonnet、Alain Duchêne、Mohamed Abarbri
DOI:10.1021/jo050638z
日期:2005.8.1
A general route to α-pyrones and 3-substituted isocoumarins from (Z)-iodovinylic acids 1a−f or 2-iodobenzoic acids 4a−c is described, including compounds bearing a substituent on the aromatic ring. Treatment of (Z)-β-iodovinylic acids 1a−f or 2-iodobenzoic acids 4a−c with various allenyltributyltin reagents in the presence of palladium acetate, triphenylphosphine, and tetrabutylammonium bromide in
描述了从(Z)-碘乙烯基酸1a - f或2-碘苯甲酸4a - c制备α-吡喃酮和3-取代的异香豆素的一般途径,包括在芳环上带有取代基的化合物。的治疗(ż)-β-iodovinylic酸1A - ˚F或2-碘酸4A - Ç在乙酸钯,三苯基膦,和存在与各种试剂allenyltributyltin四丁基溴化铵在二甲基甲酰胺中提供的相应的α吡喃酮的良好的产率3A - ķ或3-取代的异香豆素5A -克经由串联Stille反应和6-内切-Dig oxacyclization。