反应详情

A solution of the 9-[(2,6-difluorophenyl)methyl]-4-hydroxy-5-carbomethoxy carbazole (514 mg, 1.4 mM) in 5 mL THF and 20 mL concentrated aqueous ammonium hydroxide was stirred at room temperature for 64 hours. The pH was adjusted to 10.5 with 5 N HCl. The resultant precipitate was collected by filtration, resuspended in H2O, adjusted the pH to 11.7 with concentrated ammonium hydroxide. The resultant precipitate was collected by filtration. The precipitate was dissolved in ethyl acetate, washed three times with 5 N NaOH, H2O, and saturated brine, dried over anhydrous magnesium sulfate, filtered, concentrated to afford 310 mg (70%) of the 9-[(2,6-difluorophenyl)methyl]-4-hydroxy-5-carbamoyl carbazole as a yellow solid. 1H NMR (DMSO-d6) δ10.4 (s, 1H), 8.8 (br s, 1H), 8.4 (br s, 1H), 7.8 (d, 1H, J=8 Hz), 7.6-7.0 (m, 7H), 6.6 (d, 1H, J=8 Hz), and 5.7 (s, 2H). IR (KBr, cm−1) 3404, 3113, 1626, and 1587. MS (ES) m/e 351, 353.

1. filtrationThe resultant precipitate was collected by filtration
2. filtrationThe resultant precipitate was collected by filtration
3. dissolutionThe precipitate was dissolved in ethyl acetate
4. washwashed three times with 5 N NaOH, H2O, and saturated brine
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated