The unusual alcohol mediated formation of 4-oxo-2-aryl-4H-chromene-3- carboxylate (flavone-3-carboxylate) derivatives from 4-hydroxycoumarins and β-nitroalkenes in an alcoholic medium is described. The transformation occurs via the in situ formation of a Michael adduct, followed by the alkoxide ion mediated rearrangement of the intermediate. The effect of the different alcohol and nonalcohol media on the reaction was investigated.
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Zanwar, M. R. (Creator), Raihan, M. J. (Creator), Gawande, S. D. (Creator), Kavala, V. (Creator), Janreddy, D. (Creator), Kuo, C. (Creator), Ambre, R. (Creator) & Yao, C. (Creator), Unknown Publisher, 2013