Intramolekulare Cycloadditionen mit Isobenzofuranen, IX. Synthese eines Pyrano[3,2-c]carbazols / Intramolecular Cycloadditions with Isobenzofurans, IX. Synthesis of a Pyrano[3,2-c]carbazol
Open Access
- 1 February 1993
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 48 (2) , 213-223
- https://doi.org/10.1515/znb-1993-0214
Abstract
Metal catalyzed nitrogen extrusion from the diazo com pound 4b yields a furoindole (5) which can be trapped either by N-phenylmaleinimide or by dimethylacetylendicarboxylate to give 6 and 9, resp. An intramolecular Diels-Alder reaction with 13 b as starting material yields a pyrano[3,2-c]carbazole (14). Q uantum chemical calculations (AM 1, PM 3) on 1, 2, 3, 7a, 9 and 15 are reported.Keywords
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