Pyrone series. Part X. Reactivity of 4,5,6-triaryl-2-pyrones and the corresponding thio-analogues

Abstract

Several 4,5,6-triaryl-3-bromo-2-pyrones have been prepared and converted by alcoholic alkali into furancarboxylic acids. These 3-bromo-2-pyrones and some triaryl-2-pyrones when treated with phosphorus pentasulphide gave the corresponding 2-thiopyrones, from which 1-methyl-2-thiopyridones, 2-pyrone phenylhydrazones, open-chain thioamides, and 1-thio-2-pyrones were obtained. 2-Pyridones, 1-amino-2-pyridones, 1-methyl-2-pyridones, 2-methoxypyridines, and 1-methoxy-2-pyridones have also been prepared. The i.r. and u.v. spectra of these compounds are recorded.