Synthesis and Cyclization of Derivatives of 3-Heterylhydrazino-2-polyfluorobenzoylacrylic Acid
Cyclization of ethyl esters of 3-heterylhydrazino-2-polyfluorobenzoylacrylic acid results either to 2-(5-polyfluorophenyl-4-ethoxycarbonylpyrazol-1-yl)benzazoles or 2-(4-polyfluorobenzoyl-5-ethoxypyrazol-1-yl)benzenes or, in the case of benzimidazolyl derivatives possessing NH fragment, to derivatives of benzimidazolo[1,2-a]pyrazolo[1,5-c]quinazoline, a new heterocyclic system.