Hydrochloric Acid → 7H-indolo[2,1-a][2]benzazepine-10-carboxylic acid

Participants

Reaction Steps

To a stirred solution of methyl 7H-indolo[2,1-a][2]benzazepine-10-carboxylate, 13-cyclohexyl, 6-carboxylic acid (366 mg, 0.88 mmol), 2-N,N-dimethyl-2-(methylamino)acetamide (120 mg, 1.03 mmol) and triethylamine (0.37 mL) in DMF (6 mL) was added HATU (400 mg, 1.05 mmol). The reaction mixture was stirred at rt for 2 h, diluted with H2O (˜20 mL) and the resulting solids were collected by filtration, washed with H2O and dried on the filter with aspirator vacuum for 1 h. The solids were dissolved into THF/MeOH (1:1, 6 mL) and 1M NaOH (aq.) (1.5 mL, 1.5 mmol). The reaction mixture was heated in a sealed tube with microwave irradiation at 85° C. for 20 min. The reaction was cooled, neutralized with 1M HCl (aq.) (1.5 mL, 1.5 mmol) and concentrated to remove organic solvents. The residue was slurried with H2O and the solids were collected by filtration, flushed with H2O and dried to yield 7H-indolo[2,1-a][2]benzazepine-10-carboxylic acid, 13-cyclohexyl-6-[[[2-(dimethylamino)-2-oxoethyl]methylamino]carbonyl]- (406 mg, 0.81 mmol, 92%) as a yellow solid. Mixture of amide rotamers: 1HNMR (300 MHz, DMSO-d6) δ 12.58 (br s, 1H), 8.17 (br s, 0.5H), 8.13 (br s, 0.5H), 7.89 (d, J=8.8 Hz, 1H), 7.66-7.45 (m, 5H), 7.07 (br s, 0.5H), 6.90 (br s, 0.5H), 5.24-4.96 (m, 1H), 4.39-4.03 (m, 3H), 3.08-2.75 (m, 7H), 2.63 (s, 1.5H), 2.54 (s, 1.5H), 2.14-1.63 (m, 6H), 1.52-1.04 (m, 4H). LCMS: m/e 498 (M−H)−, ret time 1.36 min, column A, 2 minute gradient.

Provenance & Evidence