2-(Methylthio)benzeneboronic acid → 9-hydroxy-4-[2-(methylsulfanyl)phenyl]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-(methylthio)benzeneboronic acid according to the procedure described in example 8 gave 9-hydroxy-4-[2-(methylsulfanyl)phenyl]pyrrolo[3,4-c]carbazole-1,3(2H,6H)-dione (508) (I; Ar=2-(methylsulfanyl)phenyl) in a 72% yield, mp (MeOH/CH2Cl2)/hexane) 208–216° C. 1H NMR [(CD3)2SO] δ 11.76 (br s, 1H), 10.95 (br s, 1H), 9.25 (br s, 1H), 8.31 (d, J=2.5 Hz, 1H), 7.47 (s, 1H), 7.44 (d, J=8.6 Hz, 1H), 7.43 (td, J=7.3, 2.2 Hz, 1H), 7.38 (br d, J=7.5 Hz, 1H), 7.27 (dd, J=7.8, 2.2 Hz, 1H), 7.24 (td, J=7.3, 1.3 Hz, 1H), 7.07 (dd, J=8.7, 2.5 Hz, 1H), 2.32 (s, 3H). Found: C, 66.55; H, 3.88; N, 7.38. C21H14N2O3S.1/4H2O requires C, 66.57; H, 3.86; N, 7.39.

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