Reaction Steps
Part A. To tert-butyl 5-(2-oxohexahydro-1H-azepin-1-yl)-1-indolinecarboxylate (140 mg, 0.42 mmol) that had been prepared as in Part C of Example 15 using 6-bromohexanoyl chloride instead of 5-bromovaleryl chloride was added 10 mL of 4.0 M HCl in dioxane. The resulting solution was maintained at rt under N2 for 2 h and was then concentrated. The resulting residue was dissolved in 25 mL of EtOAc, and the organic layer was washed with saturated aqueous NaHCO3. The aqueous layer was washed with EtOAc (2×50 mL) and the combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated to afford 1-(2,3-dihydro-1H-indol-5-yl)hexahydro-2H-azepin-2-one (96 mg, 100%) as a brown oil. LC/MS (ESI+): 231.2 (M+H)+. 1H NMR (CDCl3) δ 6.9 (s, 1H), 6.79 (d, 1H), 6.76 (d, 1H), 3.98 (br s, 1H), 3.66 (br m, 2H), 3.52 (t, 2H), 3.01 (t, 2H), 2.65 (br s, 2H), 1.78 (br s, 6H). Part B. To the product from Part A (95 mg, 0.41 mmol), was added 3-(aminocarbonyl)-1-(3-cyano-4-fluorophenyl)-1H-pyrazole-5-carboxylic acid (94 mg, 0.34 mmol), 3.3 mL of pyridine, and 0.70 mL of DMF. 1,3-Diisopropylcarbodiimide (0.059 mL, 0.38 mmol) was added, and the resulting solution was stirred for 1 h. The red mixture was then poured into 1N aqueous HCl (70 mL) and washed with EtOAc (3×50 mL). The combined organic layers were washed with brine, dried over Na2SO4, and filtered. Concentration of the filtrate and purification of the resulting residue by radial chromatography (1–5% MeOH in CH2Cl2) gave 1-(3-cyano-4-fluorophenyl)-5-{[5-(2-oxohexahydro-1H-azepin-1-yl)-2,3-dihydro-1H-indol-1-yl]carbonyl}-1H-pyrazole-3-carboxamide (98 mg, 49%) as a brown residue. LC/MS (ESI+): 487.1 (M+H)+. 1H NMR (CD3OD) δ 8.08 (br m, 1H), 7.97 (br d, 1H), 7.87 (br s, 1H), 7.43 (br t, 1H), 7.28 (s, 1H), 7.12 (br s, 1H), 7.00 (br d, 1H), 4.24 (br m, 2H), 3.73 (br s, 2H), 3.16 (br m, 2H), 2.66 (br s, 2H), 1.79 (br s, 6H). Part C. To the product from Part B (92 mg, 0.19 mmol) was added 8.8 mL of DMF and 3.4 mL of H2O. Potassium carbonate (130 g, 0.95 mmol) and acetohydroxamic acid (36 mg, 0.47 mmol) were added, and the resulting mixture was warmed to 50° C. under an N2 atmosphere. After 2 h, the reaction was cooled to rt and poured into EtOAc (50 mL). The organic layer was washed with H2O (2×15 mL), brine, and dried over Na2SO4. Filtration and concentration afforded a brown oily residue that was purified by radial chromatography (10% MeOH in CH2Cl2 containing 2% NH4OH) to yield 1-(3-amino-1,2-benzisoxazol-5-yl)-5-{[5-(2-oxohexahydro-1H-azepin-1-yl)-2,3-dihydro-1H-indol-1-yl]carbonyl}-1H-pyrazole-3-carboxamide (11 mg, 12%) as a white solid. LC/MS (ESI+): 500.1 (M+H)+.
