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Crude diether 8 (0.0223 g, 0.0527 mmol) was dissolved in 1 mL dichloromethane. Ten equivalents of trifluoroacetic acid was added. The mixture was stirred at room temperature for 45 minutes. The reaction mixture was concentrated and azeotroped with toluene (2×) to give crude 7-(4-fluoro-benzyl)-9-hydroxy-5-methoxy-pyrrolo[3,4-g]quinoline-6,8-dione 9 which was triturated with 8 mL of 1:1 diethylether/hexane and filtered to give 9 (0.0161 g, 0.0456 mmol, 83% for two steps). 1H NMR (CDCl3) δ 9.0 (br s, 1 H), 8.7 (d, 1 H), 7.7 (d, 1H), 7.5 (m, 2 H), 7.0 (t, 2 H), 4.8 (s, 2H), 4.4 (s, 3H). (M+1).

1. concentrationThe reaction mixture was concentrated
2. customazeotroped with toluene (2×)