Formamide → HCID 25218058, compound

Participants

Reaction Steps

To a solution of 3M sulfuric acid (4 μL) and 36% formamide solution (9.5 mg) in tetrahydrofuran (2 mL) was added a suspension of N-[4-(3-amino-4-fluorophenyl)-2,2-dimethyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazin-7-yl]methanesulfonamide (compound obtained in Example 44; 20 mg) and sodium borohydride (1 mg) in tetrahydrofuran (3 mL) under cooling in ice/NaCl bath, and the mixture was stirred at room temperature for 1 hour. To the reaction mixture was added an aqueous saturated sodium hydrogencarbonate solution, and the mixture was extracted with ethyl acetate. The organic layer was washed with brine, dried over sodium sulfate and concentrated in vacuo. The residue was purified by column chromatography on silica gel (solvent; n-hexane/ethyl acetate=7/3→3/7) to give N-{4-[3-(dimethylamino)-4-fluorophenyl]-2,2-dimethyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazin-7-yl}methanesulfonamide (10 mg) as a colorless powder.

Provenance & Evidence