Synthesis of electron-deficient dienes bearing a chromonyl moiety via the reaction of 3-formylchromones with ylidenemalononitriles and ethyl α-cyano-β-methylcinnamate
作者:Vladislav Yu. Korotaev、Alexey Yu. Barkov、Igor B. Kutyashev、Alexander V. Safrygin、Vyacheslav Ya. Sosnovskikh
DOI:10.1016/j.tet.2014.03.105
日期:2014.6
3-Formylchromones react with ylidenemalononitriles in the presence of triethylamine in dichloromethane to produce the target electron-deficient dienes connected to the chromone system with excellent E-selectivity and in good yields. In a similar manner, their reaction with ethyl α-cyano-β-methylcinnamate gave a mixture of E,Z- and E,E-isomeric chromonyl dienes, from which the former could be isolated