J IRAN CHEM SOC (2017) 14:1945–1956 DOI 10.1007/s13738-017-1133-x ORIGINAL PAPER Aspirin: an efficient catalyst for synthesis of bis (pyrazol‑5‑ols), dihydropyrano[2,3‑ c]pyrazoles and spiropyranopyrazoles in an environmentally benign manner 1 1 1 Maryam Fatahpour · Fatemeh Noori Sadeh · Nourallah Hazeri · 1 2 Malek Taher Maghsoodlou · Mojtaba Lashkari Received: 2 December 2016 / Accepted: 2 May 2017 / Published online: 6 May 2017 © Iranian Chemical Society 2017 Abstract This article aimed to present two facile and reactions can be performed in tandem from readily availa- environmental friendly routes for the rapid assembly ble starting materials. The main merits of the present meth- of biologically active compounds including pyrazol core ods are operational simplicity, no need for column chroma- using aspirin as a novel and green catalyst. The synthesis tography, inexpensive materials, avoidance of harmless and of bis(pyrazol-5-ol) derivatives was developed via one- corrosive acid catalysts, short reaction times, good yields pot, pseudo-five-component condensation, and the target of the products, and utilization of aspirin as a non-toxic, dihydropyrano[2,3-c]pyrazoles and spiropyranopyrazoles cheap, commercially available, and efficient catalyst. were prepared by one-pot, four-component reaction. These * Nourallah Hazeri firstname.lastname@example.org; email@example.com Department of Chemistry, Faculty of Sciences, University of Sistan and
Journal of the Iranian Chemical Society – Springer Journals
Published: May 6, 2017
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