Tetrahedron letters

Synthese de dihydroxy phenacylidene triphenylphosphoranes nouveaux precurseurs de composes flavonoides: Synthese d'hydroxy-6 et hydroxy-7 chromones.

Y Le Floc'h, M Lefeuvre

文献索引：Le Floc'H, Yves; Lefeuvre, Martine Tetrahedron Letters, 1986 , vol. 27, # 24 p. 2751 - 2752

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摘要

Abstract The synthesis of two new dihydroxy phenacylidene triphenylphosphoranes from 2, 4-dibenzoyloxy and 2, 5-dibenzoyloxy acetophenones is described. By acylation of the hydroxyl groups of theses ylids, intramolecular of the esters carbonyl group and hydrolysis of the second esters group, some 6-hydroxy and 7-hydroxy chromones are prepared with good yields.