G. Alunnibistocchi et al., 2,4-DIMETHYL-6 H-PYRIDO[3,2-B]CARBAZOLE, AN ISOMER OF THE ANTITUMOR ALKALOID ELLIPTICINE VIA THE COMBES-BEYER REACTION, Die Pharmazie, 48(11), 1993, pp. 817-820
The synthesis of 2,4-dimethyl-6 H-pyrido[3,2-b]carbazole (2a) and of i
ts 9-methoxy (2b) and 9-hydroxy (2c) derivatives via the Combes-Beyer
reaction is described. Pyridocarbazole 2a has been obtained by two dif
ferent routes. In the course of the synthesis of 2b either a partial o
r a total demethoxylation has been observed depending on the route emp
loyed.