Alcohol Mediated Synthesis of 4‑Oxo-2-aryl‑4H‑chromene-3-carboxylate Derivatives from 4‑Hydroxycoumarins
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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.
创建时间：
2016-02-20
