2-Methoxyphenylboronic acid → 9-hydroxy-4-(2-methoxyphenyl)pyrrolo[3,4-c]carbazole-1,3(2H,6H)-dione

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The reaction of 9-hydroxy-4-iodopyrrolo[3,4-c]carbazole-1,3(2H,6H)-dione, prepared as in example 7, with 2-methoxybenzeneboronic acid according to the procedure described in example 8 gave 9-hydroxy-4-(2-methoxyphenyl)pyrrolo[3,4-c]carbazole-1,3(2H,6H)-dione (20) (I, Ar=2-methoxyphenyl) in a 75% yield, mp 216° C. 1H NMR δ [(CD3)2SO] 11.70 (s, 1H), 10.90 (s, 1H), 9.23 (s, 1H), 8.31 (d, J=2.4 Hz, 1H), 7.50 (s, 1H), 7.43 (d. J=8.0 Hz, 1H), 7.43–7.38 (m, 1H), 7.31 (dd, J=8.0, 2.4 Hz, 1H), 7.11–7.01 (m, 3H), 3.68 (s, 3H). Found: C, 69.21; H, 3.80; N, 7.58. C21H14N2O4,1/4H2O requires C, 69.51; H, 4.03; N, 7.72.

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