Alcohol Mediated Synthesis of 4-Oxo-2-aryl-4<i>H</i>-chromene-3-carboxylate Derivatives from 4-Hydroxycoumarins
作者:Manoj R. Zanwar、Mustafa J. Raihan、Sachin D. Gawande、Veerababurao Kavala、Donala Janreddy、Chun-Wei Kuo、Ram Ambre、Ching-Fa Yao
DOI:10.1021/jo301044y
日期:2012.8.3
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