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The synthesis of a new brick heterocyclic system of quinoxaline was developed by a cyclocondensation reaction starting from o-phenylenediamine derivatives. Thus 6-chloroquinoxaline-2,3(1H,4H)–dione was obtainedin excellent yield by condensation of 4-Chloro-o-phenylenediamine with oxalic acid at reflux in a hydrochloric acid solution. Thealkylationreactions werethen carried out and optimized by using monohalogenated agents under phase transfer catalysis conditions. The reaction studied lead todoi:10.48369/imist.prsm/jmch-v17i1.12212 fatcat:tvalycw6inabha6crav7jngb2e