1,1'-Carbonyldiimidazole → 7-Chloro-3-(aminocarbonyl)pyrazolo[3,4-c][1]benzazepine-4,10(1H,9H)-dione

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Reaction Steps

A solution of 7-chloro-3-(carboxy)pyrazolo[3,4-c][1]-benzazepine-4,10-(1H,9H)-dione (1 g, 3.44 mmol) (compound of Example 9) and 1,1′-carbonyldiimidazole (0.64 mg, 3.95 mmol) in N,N-dimethylformamide (25 mL) was stirred for 64.5 hours. In one portion, ammonium acetate (0.796 mg, 10.33 mmol) was added, followed by additional N,N-dimethylformamide (15 mL). The solution was stirred for 3.75 hours at room temperature and concentrated in vacuo for 45 minutes. The residue was washed with water (63×20 mL). The insoluble material was filtered and dried to give the title compound (967 mg, 97% yield, m.p. 224-225° C.).

Provenance & Evidence