4-(Tetramethyl-1,3,2-dioxaborolan-2-yl)aniline → 4-(4-aminophenyl)-9-hydroxypyrrolo[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 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenylamine according to the procedure described in example 8 gave 4-(4-Aminophenyl)-9-hydroxypyrrolo[3,4-c]carbazole-1,3(2H,6H)-dione (16) (I, Ar=4-aminophenyl) in a 57% yield; mp 256–258° C. 1H NMR δ [(CD3)2SO] 11.60 (s, 1H), 10.92 (s, 1H), 9.19 (s, 1H), 8.31 (d, J=2.3 Hz, 1H), 7.48 (s, 1H), 7.39 (d, J=8.6 Hz, 1H), 7.30 (d, J=8.4 Hz, 2H), 7.02 (dd, J=8.6, 2.3 Hz, 1H), 6.62 (d, J=8.4 Hz, 2H), 5.29 (br s, 2H). Found: C, 68.09; H, 4.34; N, 11.03. C20H13N3O3.1/2H2O requires C, 68.17; H, 4.00; N, 11.92.

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