Synthesis of Fluoroquinoxalin-2(1H)-one Derivatives Containing Substituents in the Pyrazine and Benzene Fragments

6,7-Difluoroquinoxalin-2-one reacted with indoles, 5,5-dimethylcyclohexane- 1,3-dione, 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one, resorcinol, and pyrogallol on heating in acetic acid to give products of hydrogen substitution in the heterocyclic fragment. Heating of 6,7-difluoro-3-(1H-indol-3-yl) quinoxalin2(1H)-ones with N-methylpiperazine gave the corresponding 7-(4-methylpiperazin-1-yl) derivatives.