8-(Benzyloxy)-4-(2-chlorophenyl)-9-methoxy-4,5,6,10c-tetrahydropyrrolo[3,4-c]carbazole-1,3(2H,3aH)-dione → 8-(Benzyloxy)-4-(2-chlorophenyl)-9-methoxypyrrolo[3,4-c]carbazole-1,3(2H,6H)-dione

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Reaction Steps

Aromatisation of (161) prepared as described in example 261 with manganese dioxide using the procedure described in example 79 gave the carbazole (162) (93%) as an orange powder, mp 260–264° C. 1H NMR δ [(CD3)2SO] 11.86 (s, 1H), 11.01 (s, 1H), 8.43 (s, 1H), 7.58–7.34 (m, 10H), 7.26 (s, 1H), 5.26 (s, 2H), 3.91 (s, 3H). Found: C, 69.65; H, 3.84; N, 5.61. C28H19ClN2O4 requires C, 69.64; H, 3.97; N, 5.80.

Provenance & Evidence