[Br:1][C:2]1[CH:7]=[CH:6][C:5]([SH:8])=[CH:4][CH:3]=1.[H-].[Na+].[F:11][C:12]([F:26])([F:25])[CH2:13]OS(C1C=CC(C)=CC=1)(=O)=O.O>CN(C)C=O>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([S:8][CH2:13][C:12]([F:26])([F:25])[F:11])=[CH:4][CH:3]=1
Dissolve 4-bromo-benzenethiol (1.0 g, 5.3 mmol) in dry dimethylformamide (50 mL) and cool to 0° C. under nitrogen. Add dry sodium hydride (152 mg, 6.4 mmol), portionwise. After the vigorous gas evolution stops, add toluene-4-sulfonic acid 2,2,2-trifluoro-ethyl ester (2.0 g, 8.0 mmol) and stir the reaction overnight at room temperature. Slowly pour the reaction into water (400 mL) and extract with ethyl acetate (2×50 mL). Wash the combined organic layers with water (100 mL) and brine (100 mL). Dry the organic layer with sodium sulfate, filter and concentrate in vacuo. Chromatograph the resultant residue on a SiO2 column with hexanes to yield 640 mg of 1-bromo-4-(2,2,2-trifluoro-ethylsulfanyl)-benzene (45%).
Wird geladen…
