Polyvinylpolypyrrolidone-supported triflic acid (PVPP.OTf) has been used as a recyclable catalyst for synthesis of a series of 7-hydroxy-10-aryl-10H-indeno[1,2-b]chromen-11-one derivatives by condensation of aldehydes, resorcinol, and 2H-indene-1,3-dione. 13-Phenylindeno[1,2-b]naphtho[1,2-e]pyran-12(13H)-one and 12-phenyl-12H-indeno[1,2-b]naphtho[3,2-e]pyran-5,11,13-trione were also synthesized by condensation of benzaldehyde, β-naphthol or 2-hydroxynaphthalene-1,4-dione, and 2H-indene-1,3-dione with PVPP.OTf as catalyst. The heterogeneous catalyst was used for four runs. This method has the advantages of high yields, simple methodology, short reaction times, and easy work-up.
Research on Chemical Intermediates – Springer Journals
Published: Feb 15, 2015
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