Unlike most of other aromatic amines, 4-methoxyaniline with methyl comenate (1) in the mixture of acetic acid and methanol (1:1) gave two unexpected products with azomethyne moiety. The structures of new compounds were determined from their characteristic spectroscopic behaviour and were confirmed by X-ray crystallographic measurements.
Abstract The reaction of aromatic amine and 5-hydroxy-4-pyrone carboxylates in glacial acetic acid gave new type of 4-pyronederivatives, that is 5-arylamino-4-pyrone carboxanilides (3-9).