Chloroacetyl chloride → 5-Hydroxy-2H-1,4-benzoxazin-3(4H)-one

反応式

Cl[CH2:2][C:3](Cl)=[O:4].[NH2:6][C:7]1[C:12]([OH:13])=[CH:11][CH:10]=[CH:9][C:8]=1[OH:14].C([O-])([O-])=O.[K+].[K+]>CN(C=O)C>[OH:13][C:12]1[C:7]2[NH:6][C:3](=[O:4])[CH2:2][O:14][C:8]=2[CH:9]=[CH:10][CH:11]=1

参加物

実験手順

TEA (3.34 ml, 2 equiv.) and after chloroacetyl chloride (1.15 ml, 1.2 equiv.) were added dropwise to a solution of commercially available 2-aminobenzene-1,3-diol (1.5 g, 11.99 mmol) in 20 ml of DMF. After one hours of stirring at room temperature, K2CO3 (3.3 g, 2 equiv.) was added and the reaction was stirred at room temperature overnight. The solvent was evaporated and to the residue water was added. After filtration, the solid material was washed with MeOH and diethyl ether giving 410 mg of a grey solid. Yield=21% 1HNMR (DMSO, 200 MHz) δ 3.47 (1H, bs), 4.47 (2H, s), 6.44 (2H, m), 6.72 (1H, t, J=8 Hz)