JOURNAL OF HETEROCYCLIC CHEMISTRY, vol.40, no.6, pp.1005-1010, 2003 (SCI-Expanded)
The synthesis of 11-methyl-6H-pyrido[4,3-b]carbazole-1(2H)-one (5), which can be important for the synthesis of other pyridocarbazole alkaloids and especially 1-substituted ellipticines, is described. Construction of the tetracyclic structure was achieved by a new route and two important precursor compounds (4a and 4b) for the synthesis of pyridocarbazole alkaloids and also many new tetrahydrocarbazole derivatives (7, 8, 9, 10, 11, 12, 13) were synthesized.