Water → HCID 10621601, Verbindung

Reaktionsgleichung

[CH3:1][S:2]([NH:5][C:6]1[C:16]([O:17][C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)=[CH:15][C:9]2[C:10](=[O:14])[CH2:11][CH2:12][O:13][C:8]=2[CH:7]=1)(=[O:4])=[O:3].[Br:24]Br.O>C(Cl)(Cl)Cl>[Br:24][CH:11]1[C:10](=[O:14])[C:9]2[CH:15]=[C:16]([O:17][C:18]3[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=3)[C:6]([NH:5][S:2]([CH3:1])(=[O:3])=[O:4])=[CH:7][C:8]=2[O:13][CH2:12]1

Komponenten

Versuchsvorschrift

In 300 ml of chloroform was dissolved 33.3 g of 2,3-dihydro-7-methylsulfonylamino-6-phenoxy-4H-1-benzopyran-4-one. To this solution being maintained at 25°-30° C. was dropwise added 16.3 g of bromine in 30 minutes. After the completion of the dropwise addition, the mixture was stirred for 30 minutes at 25°-30° C. 100 ml of water was added thereto. The organic layer was separated, washed with a 5% aqueous sodium thiosulfate solution, water and a saturated aqueous sodium chloride solution in this order, and dried with anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure to obtain 40.1 g (yield: 97.3%) of 3-bromo-2,3-dihydro-7-methylsulfonylamino-6-phenoxy-4H-1-benzopyran-4-one.