Reaction Steps
7-Nitro-1,3,4,5-tetrahydro-benzo[b]azepin-2-one (375 mg, 1.82 mmol) and methyl bromoacetate (417 mg, 2.73 mmol) were dissolved in anhydrous DMF. Sodium hydride (60% in mineral oil, 146 mg, 3.64 mmol) was added, and the mixture was heated to 60° C. for 2 hours. After cooling to room temperature, the mixture was partitioned between ethyl acetate and water, washed once with water, and concentrated to a brown oil. Preparative TLC (50% EtOAc/hexane) afforded (7-Nitro-2-oxo-2,3,4,5-tetrahydro-benzo[b]azepin-1-yl)-acetic acid methyl ester as a yellow solid, 454 mg. (90% yield) 1H NMR (400 MHz, DMSO-d6) δ 8.23 (s, 1H), 8.12-8.18 (m, 1H), 7.51-7.56 (m, 1H), 4.60 (s, 2H), 3.62 (s, 3H), 2.93-3.00 (m, 2H), 2.05-2.20 (m, 4H); MS (m/e) 279 (M+1). 8b) 7-Nitro-2-oxo-2,3,4,5-tetrahydro-benzo[b]azepin-1-yl)-acetic acid methyl ester 9 (454 mg, 1.63 mmol), ammonium formate (400 mg), and 10% palladium on carbon (200 mg) were suspended in ethanol (8 ml) and heated to reflux 30 minutes. The heat was removed, and additional amounts of ammonium formate (400 mg) and 10% palladium on carbon (200 mg) were added. The mixture was refluxed an additional 30 minutes, cooled to room temperature, filtered through Celite, and concentrated. The resulting brown residue was partitioned between ethyl acetate and water, washed once with water, and concentrated. Preparative TLC (50% EtOAc/hexane) afforded (7-Amino-2-oxo-2,3,4,5-tetrahydro-benzo[b]azepin-1-yl)-acetic acid methyl ester as a white foam, 270 mg. (67% yield) 1H NMR (400 MHz, DMSO-d6) δ 6.86-6.91 (m, 1H), 6.38-6.44 (m, 2H), 5.06 (s, 2H), 4.44 (s, 2H), 3.61 (s, 3H), 2.51-2.82 (m, 2H), 1.92-2.22 (m, 4H); MS (m/e) 249 (M+1). 8c) 7-Amino-2-oxo-2,3,4,5-tetrahydro-benzo[b]azepin-1-yl)-acetic acid methyl ester (270 mg, 1.09 mmol), 2-(2,5-Dichloro-pyrimidin-4-ylamino)-N-methyl-benzenesulfonamide (362 mg, 1.09 mmol) and 4N HCl in dioxane (0.273 ml, 1.09 mmol) were dissolved in 2-methoxyethanol (5 ml) and heated to 120° C. for 18 hours. The mixture was concentrated to a brown oil. Preparative TLC (5% MeOH/CH2Cl2) gave the title compound as a white solid, 327 mg. (55% yield) 1H NMR (400 MHz, DMSO-d6) δ 9.58 (s, 1H), 9.23 (s, 1H), 8.38-8.50 (m, 1H), 8.29 (s, 1H), 7.72-7.87 (m, 2H), 7.60-7.68 (m, 1H), 7.54 (s, 1H), 7.46-7.51 (d, 1H), 7.28-7.35 (m, 1H), 7.22-7.29 (m, 1H), 4.48 (s, 2H), 3.63 (s, 3H), 2.53-2.84 (m, 2H), 2.44 (s, 3H), 1.96-2.26 (m, 4H); MS (m/e) 545 (M+1); retention time 8.28 minute; mp 237-239° C.
