Tetrahedron Letters p. 2751 - 2752 (1986)
Update date:2022-08-05
Topics:
Le Floc'H, Yves
Lefeuvre, Martine
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 these ylides, intramolecular olefination of the ester carbonyl group and hydrolysis of the second ester group, some 6-hydroxy and 7-hydroxy chromones are prepared with good yields.
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Doi:10.1016/0022-328X(86)82045-9
(1986)Doi:10.1021/ic800508t
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