Poly(4-vinylpyridinium)hydrogen sulfate: A novel and efficient catalyst for the synthesis of 13-aryl-indeno[1,2-b]naphtha[1,2-e]pyran-12(13H)-ones under solvent-free conditions

An facile and efficient protocol for the synthesis of 13-aryl-indeno[1,2-b]naphtha[1,2-e]pyran-12(13H)-ones has been developed that proceeds via the one-pot three-component sequential reaction of an aromatic aldehyde with β-naphthol and 2H-indene-1,3-dione under solvent-free conditions in the presence of a poly(4-vinylpyridinium)hydrogen sulfate (P(4-VPH)HSO4) catalyst. The catalyst can be reused several times, making this procedure facile, practical, and sustainable. The simple experimental procedure, solvent-free reaction conditions, use of an inexpensive catalyst, short react time, and excellent yields are some of the major advantages of this methodology.

Graphical AbstractA simple and efficient method for the synthesis of 13-aryl-indeno[1,2-b] naphtha[1,2-e]pyran-12(13H)-ones has been developed that proceeds via a one-pot three-component sequential reaction involving an aromatic aldehyde, β-naphthol, and 2H-indene-1,3-dione under solvent-free conditions catalyzed by poly(4-vinylpyridinium)hydrogen sulfate (P(4-VPH)HSO4).Figure optionsDownload full-size imageDownload as PowerPoint slide