Synthesis of substituted flavones and arylchromones using P and Si keggin heteropolyacids as catalysts

DANIEL O. BENNARDI; GUSTAVO P. ROMANELLI; JORGE L. JIOS; PATRICIA G. VÁZQUEZ; CARMEN V. CÁCERES; JUAN C. AUTINO.

Heterocycles Communication

estados unidos

Año: 2006 p. 150 - 160

A simple and clean procedure for the preparation of functionalized flavones and chromones using commercial Keggin heteropolyacid in acetonitrile medium is described for the cyclization of 1-(2-hydroxyaryl)-3-aryl-1,3-propanodiones. Sixteen examples are reported, yields ranging in 60-91%; five substituted 2-naphthylchromones are prepared for the first time.