2-Methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenol → 9-hydroxy-4-(4-hydroxy-3-methoxyphenyl)pyrrolo[3,4-c]carbazole-1,3(2H,6H)-dione

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Reaction Steps

The reaction of 9-hydroxy-4-iodopyrrolo[3,4-c]carbazole-1,3(2H,6H)-dione, prepared as in example 7, with 2-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenol according to the procedure described in example 8 gave 9-hydroxy-4-(4-hydroxy-3-methoxyphenyl)pyrrolo[3,4-c]carbazole-1,3(2H,6H)-dione (23) (I, Ar=4-hydroxy-3-methoxyphenyl) in a 58% yield; mp 290–295° C. (dec). 1H NMR δ [(CD3)2SO] 11.67 (br s, 1H), 10.97 (br s, 1H), 9.22 (br s, 1H), 9.15 (s, 1H), 8.33 (d, J=2.4 Hz, 1H), 7.57 (s, 1H), 7.41 (d, J=8.6 Hz, 1H), 7.23 (d, J=2.0 Hz, 1H), 7.04 (m, 2H), 6.86 (d, J=8.1 Hz, 1H), 3.82 (s, 3H). FABMS found [M+H]+: 375.0973. C21H15N2O5 requires 375.0981.

Provenance & Evidence