Ethyl 3-bromo-2-oxobutanoate → HCID 68089378、化合物
反応式
[NH2:1][C:2]1[C:7]2[O:8][CH2:9][CH2:10][N:11]([C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])[C:6]=2[CH:5]=[CH:4][N:3]=1.Br[CH:20]([CH3:28])[C:21](=O)[C:22]([O:24][CH2:25][CH3:26])=[O:23]>C1COCC1>[CH3:28][C:20]1[N:3]2[C:2]([C:7]3[O:8][CH2:9][CH2:10][N:11]([C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])[C:6]=3[CH:5]=[CH:4]2)=[N:1][C:21]=1[C:22]([O:24][CH2:25][CH3:26])=[O:23]参加物
4
実験手順
To a solution of tert-butyl 5-amino-2,3-dihydropyrido[3,4-b][1,4]oxazine-1-carboxylate (2.1 g, 8.37 mmol) in 100 mL of THF was added ethyl 3-bromo-2-oxobutanoate (3.482 g, 16.74 mmol). The mixture was stirred under reflux overnight. After removal of the solvent, the crude product was purified by silica gel column chromatography (EtOAc/PE v/v 2:1) to give 10-tert-butyl 4-ethyl 5-methyl-13-oxa-3,6,10-triazatricyclo[7.4.0.0{2,6}]trideca-1(9),2,4,7-tetraene-4,10-dicarboxylate (757 mg, 25% yield).