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Beilstein J. Org. Chem. 2016, 12, 2490–2494, doi:10.3762/bjoc.12.243
Graphical Abstract
Figure 1: Natural indolo[3,2-a]carbazole alkaloids.
Scheme 1: Retrosynthetic analysis of indolo[3,2-a]carbazoles.
Scheme 2: Reagents and conditions: (a) H2SO4, MeOH; (b) Ar-NH2, Pd(OAc)2, BINAP, dioxane, 100 °C; (c) 5 mol %...
Scheme 3: Substrate scope for Pd-catalyzed twofold annulations.