3-Formylphenylboronic acid → 3-(9-Hydroxy-1,3-dioxo-1,2,3,6-tetrahydropyrrolo[3,4-c]carbazol-4-yl)benzaldehyde

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Reaktionsschritte

The reaction of 9-hydroxy-4-iodopyrrolo[3,4-c]carbazole-1,3(2H,6H)-dione, prepared as in example 7, with 3-formylbenzeneboronic acid according to the procedure described in example 8 gave 3-(9-Hydroxy-1,3-dioxo-1,2,3,6-tetrahydropyrrolo[3,4-c]carbazol-4-yl)benzaldehyde (507) (I; Ar=3-formylphenyl) in a 69% yield; mp (THF/CH2Cl2/pentane) 280–286° C. (dec). 1H NMR [(CD3)2SO] δ 11.82 (br s, 1H), 11.07 (br s, 1H), 10.11 (s, 1H), 9.27 (br s, 1H), 8.35 (d, J=2.4 Hz, 1H), 8.14 (t, J=1.4 Hz, 1H), 7.97 (m, 2H), 7.70 (t, J=7.7 Hz, 2H), 7.65 (s, 1H), 7.46 (d, J=8.7 Hz, 1H), 7.08 (dd, J=8.7, 2.5 Hz, 1H). FABMS found [M+H]+: 357.0857. C21H13N2O4 requires 357.0875.

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