[C:1]1([CH:7]2[NH:16][C:15]3[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=3)[NH:9][C:8]2=[O:17])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[N:18]([O-])=[O:19].[Na+]>Cl.O>[N:18]([N:16]1[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[NH:9][C:8](=[O:17])[CH:7]1[C:1]1[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1)=[O:19]A suspension of 3,4-dihydro-3-phenylquinoxalin-2(1H)-one (430 mg, 1.9 mmol) in 3N HCl (30 mL) was stirred at 5° C. Sodium nitrite (150 mg, 2.17 mmol) in water (1 mL) was added dropwise and stirring was continued for 1 h. The reaction mixture was extracted with DCM. The organic layer was dried over sodium sulfate and concentrated under vacuum to obtain 475 mg of 3,4-dihydro-4-nitroso-3-phenylquinoxalin-2(1H)-one.
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