Synthesis of New Pyrano[2′,3′: 5,6]chromeno[4,3‐b]quinolin‐4‐ones via Aza‐DielsAlder Reaction |
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Authors: | Bejjanki Naveen Kumar Akkaladevi Venkatesham Kommu Nagaiah Nanubolu Jagadeesh Babu |
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Institution: | 1. Division of Organic and Biomolecular Chemistry, CSIR ‐ Indian Institute of Chemical Technology, Hyderabad 500 067, India, (phone: +91‐40‐27191659;2. fax: +91‐40‐27191659);3. Laboratory of X‐Ray Crystallography, CSIR ‐ Indian Institute of Chemical Technology, Hyderabad , 500 007, India |
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Abstract: | New pyrano2′,3′: 5,6]chromeno4,3‐b]quinolin‐4‐ones have been synthesized by intramolecular aza‐Diels? Alder reaction of the azadienes generated in situ from aryl amines and 8‐formyl‐7‐(prop‐2‐ynyl)2,3‐disubstituted chromones using CuFe2O4 nanoparticles as a catalyst in DMSO at 80–90° in good‐to‐excellent yields. Particularly valuable features of this methodology include simple implementation, inexpensive and reusable catalyst, and good yields. The structures were established by spectroscopic data and further confirmed by X‐ray diffraction analysis of one of the products. |
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Keywords: | Pyrano[4 3‐b]quinoline Diels Alder reaction Nanoparticles |
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