818739.sch.002
Scheme 2: Approaches to novel carbazoles. Reaction condition and reagents: (a) cupric nitrate in acetic anhydride; (b) Piperazine, DCM; (c) N,N-dimethyl ethane-1, 2-diamine, DCM (d), dimethyl amine in methanol (e) methyl iodide in CCl4; (f) potassium ferricyanide solution in sodium hydroxide; (g) phenyl hydrazine in ethylene.