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Methyl 3-anilino-2-(benzoylamino)but-2-enoates 3a-h were prepared from methyl 2- benzoylamino-3-oxobutanoate 1 and anilines 2a-h. Heating of butenoates 3a-h in refuxing anisole resulted in intramolecular cyclocondensation between the arylamino and benzoyl group to give methyl 1-aryl-5-methyl-2-phenyl-1H-imidazole-4-carboxylates 4a-h. In the case of butenoates 3g,h, 4-(1-(arylamino)ethylidene)-2-phenyl-1,3-oxazol-5(4H)-ones 5g,h were also formed as side products.

Intramolecular thermal cyclizations of methyl (E)-3-arylamino-2-benzoylaminobut-2-enoates