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. Author manuscript; available in PMC: 2008 Jun 9.
Published in final edited form as: European J Org Chem. 2006;(9):2055–2059. doi: 10.1002/ejoc.200600077

Scheme 5.

Scheme 5

Synthesis of benzodiazepinedione-fused tetracyclic compounds 3a–d.a) 2-nitrobenzoylchloride (3 equiv), Et3N (2 equiv), DMF, 80 °C, 2 h, F-SPE. b) Zn dust (10 equiv), AcOH, sonication, 25 °C, 2 h, F-SPE, 65–71%. c) DBU (2 equiv), dioxane, μw (130 °C, 5 min), F-SPE, HPLC.