Thiazole analogs of chalcone and flavone

New thiazole analogs of chalcones and their epoxides were obtained. Thiazole analogs of flavone and isoflavone were synthesized for the first time on the basis of these compounds. It is shown that o-hydroxyphenylpyrazole derivatives are formed by the action of hydrazine hydrate on 2-(4-thiazolyl)chromones. The PMR spectra of the new substances are presented and discussed.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1202–1208, September, 1981.