Sodium hydride → 3-Amino-1-cyclopropyl-6,7-difluoro-1H-quinazoline-2,4-dione

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Reaction Conditions

Reaction Steps

To a solution of 1-cyclopropyl-6,7-difluoro-1H-quinazoline-2,4-dione (Example 23a, 2.0 g, 8.92 mmol) in dioxane (7.5 mL) and dimethylformamide (7.5 mL) is added NaH (60% dispersion in oil, 428 mg, 10.7 mmol). The solution is heated to 60° C. for 10 minutes and cooled to room temperature. To the cooled solution is added O-(2,4-dinitrophenyl)hydroxylamine (1.77 g, 8.92 mmol), and the solution is heated to 80° C. for 30 minutes. The resulting red solution is cooled to room temperature, poured over crushed ice, and extracted with EtOAc. The combined organic layers are dried over MgSO4, filtered, and the solvent removed under reduced pressure. The resulting solid is triturated with Et2O and air dried to afford 1.44 g of the title compound. MS CI: m/z 254 (MH+).

Provenance & Evidence