Cyclization of N-alkylazinium cations with bisnucleophiles. 3. endo adducts in the reaction of quinoxalium salts with ?-diketones and their x-ray diffraction analysis

Features of -C-C- coupling of quinoxaline-2-one with ethyl acetoacetate under acid catalysis

“…The features of the synthesis and biological activity of quinoxaline derivatives are described in the review [4]. It was previously reported that quinoxaline salts interact with acetylacetone or ethyl acetoacetate in the presence of base catalysis (diethyl and triethylamines) to form 3a,4,9,9a-tetrahydro-endo-furo [2,3-b]quinoxalines [5].…”