One-pot Synthesis of Tetrahydrobenzo[b]pyrans and Pyranopyrazoles Tetrahydrochromenochromene by Ammonium Fluoride

Document Type : Research Article

Authors

Department of Chemistry, Rasht Branch, Islamic Azad University, Rasht, I.R. IRAN

Abstract

Consideration for the development of new methods for the efficient preparation of heterocyclic compounds is an important issue in the synthesis of organic compounds in chemistry. The benzo[b]pyrans and pyranopyrazoles are important heterocyclic compounds that constitute the structural unit of a series of important natural biological products. In this research, ammonium fluoride was successfully applied to perform a one-pot reaction of aryl aldehydes, dimedone, or 1,3-cyclohexadione and malononitrile in EtOH:H2O (1:1) at room temperature to provide a series of tetrahydrobenzo[b]pyrans in excellent yields. Furthermore, ammonium fluoride catalyzed four-component condensations of aldehyde, malononitrile, hydrazine hydrate, and ethyl acetoacetate to synthesize pyranopyrazole derivatives in EtOH:H2O (1:1) at 80 °C. Clean methodologies, short reaction time, high yields, cost-effective catalysts, non-toxic, and environmentally friendly solvent are some advantages of this research. All products were characterized by spectral data and by comparison with authentic samples reported in the literature.

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