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Paper | Regular issue | Vol 57, No. 8, 2002, pp.1413-1421
Published online, 1st January, 1970
DOI: 10.3987/COM-02-9499
Synthesis and NMR Structural Assignment of 3-Benzoylpyrrolo[2,3-b]quinoxalin-2(4H)-ones

Katarzyna Ostrowska,* Marek Zylewski, and Krzysztof Walocha

*Department of Organic Chemistry, Jagiellonian University, R.Ingardena 3, PL-30060 Kraków, Poland

Abstract

A series of 3-benzoylpyrrolo[2,3-b]quinoxalin-2(4H)-ones, potential bioactive compounds have been synthesized. Their preparation is based on the efficient, regiospecific condensation of o-phenylenediamine with pyrrolidine-2,3,5-trione (1) or its enaminone derivatives, respectively, affording two polymorphic forms of the latter in solid. The NMR spectral assignment of 3-benzoylpyrrolo[2,3-b]quinoxalin-2(4H)-ones confirms the presence of only one isomer with enaminone moiety in solution.