Efficient Synthesis of (3<i>E</i>)‐3‐[Amino(aryl)methylidene]chromane‐2,4‐diones (=(3<i>E</i>)‐3‐[Amino(aryl)methylene]‐2<i>H</i>‐1‐benzopyran‐2,4(3<i>H</i>)‐diones) <i>via</i> a Three‐Component Reaction

Abstract

Abstract The Michael ‐type addition of a 4‐hydroxycoumarin (=4‐hydroxy‐2 H ‐1‐benzopyran‐2‐one) 1 to a β ‐nitrostyrene (=(2‐nitroethenyl)benzene) 2 in the presence of AcONH 4 leads to substituted (3 E )‐3‐[amino(aryl)methylidene]chroman‐2,4‐diones (=(3 E )‐3‐[amino(aryl)methylene]‐2 H ‐1‐benzopyran‐2,4(3 H )‐diones) 4 ( Table 1 ). High yields, short reaction time, and easy workup are advantages of this novel one‐pot three‐component reaction.