Cyclecondensation of 3‐amino‐1,2,4‐triazole with substituted methyl cinnamates

Abstract The reaction of 3‐amino‐1,2,4‐triazole ( 1 ) with substituted methyl cinnamates 2a‐h leads selectively to the formation of 7‐aryl‐6,7‐dihydro[1,2,4]triazolo[1,5‐ a ]pyrimidin‐5(4 H )‐ones 3a‐h . The structure eluci dation of the products is based on ir, 1 H and 13 C nmr measurements and X‐ray diffraction.