[NH2:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]([CH3:11])[C:3]=1[C:4]([NH2:6])=[O:5].C(N(CC)CC)C.Cl[C:20](=[O:26])[C:21]([O:23][CH2:24][CH3:25])=[O:22]>C1COCC1>[NH2:6][C:4]([C:3]1[C:7]([CH3:11])=[CH:8][CH:9]=[CH:10][C:2]=1[NH:1][C:20](=[O:26])[C:21]([O:23][CH2:24][CH3:25])=[O:22])=[O:5]To a solution of 2-amino-6-methylbenzamide (1.28 g, 8.52 mmol) and triethylamine (1.03 g, 10.2 mmol) in THF (30 mL) was added dropwise ethyl chloroglyoxylate (1.28 g, 9.38 mmol) under ice-cooling, and the mixture was stirred at room temperature for 3 hr, and extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over sodium sulfate, and concentrated under reduced pressure. The residue was suspended in diisopropyl ether-ethanol, and the insoluble material was collected by filtration to give ethyl ((2-(aminocarbonyl)-3-methylphenyl)amino)(oxo)acetate as a white powder (1.85 g, 87%).
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