Transformations of hetarylideneoxazolones

Hetarylideneoxazolones are converted to hetarylideneamino acid esters by methanolysis in the presence of sodium. Alkaline hydrolysis in aqueous alcohol gives the corresponding amino acids. Hydrazinolysis of pyranylideneoxazolone gives pyranylideneamino acid hydrazide. Complete hydrolysis of oxazolone gives formylpyran, the methylation of which gives the methoxymethylpyrylium salt. Benzamidomethyl-substituted pyrylium salts were obtained by treatment of the hetarylideneamino acids with perchloric acid.Deceased.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 757–763, June, 1976.