Abstract
A new synthetic route for the synthesis of 5‐methyl‐6H‐pyrido[4,3‐b]carbazole (8), so‐called 11‐demethylellipticine, was described. Construction of the tetracyclic structure hexahydro‐1H‐pyrido[4,3‐b]carbazol‐5(6H)‐one skeleton (6) was also achieved by nucleophilic substitution reaction in the synthetic route. Also new tetrahydrocarbazole derivatives (2, 3, 4, and 5) were synthesized. Several ellipticine analogs and octahydropyridocarbazole‐based G‐protein coupled receptors inhibitors can also be synthesized from tetracyclic structure (6) because of carbonyl functionality at position 5.
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