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Pyrazolo[4?,3?:5,6]pyrano[2,3-b]quinoxalin-4(1H)-one: Synthesis and characterization of a novel tetracyclic ring system
(Chemical Equation Presented) Derivatives of the hitherto unknown ring system, pyrazolo[4?,3?:5,6]pyrano[2,3-b]quinoxalin-4(1H)-one, are synthesized in one step from the corresponding 1-substuituted or 1,3-disubstituted 2-pyrazolin-5-ones and 3-chloroquinoxaline-2-carbonyl chloride using calcium hydroxide in boiling 1,4-dioxane. The parent system carrying no substituent in positions 1 and 3 is obtained upon treatment of the 1-PMB (p-methoxybenzyl) protected congener with trifluoroacetic acid. Detailed NMR spectroscopic investigations including unambiguous chemical shift assignments of all 1H, 13C, and 15N resonances of the obtained tetracycles are reported.
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Quinoxaline – Wikipedia,
Quinoxaline | C8H6N1021 | ChemSpider