反应详情

To a suspension of 2-(5-fluoro-6-methoxybenzothiazol-2-yl)-3-furan-2-yl-3-hydroxyacrylonitrile (70 mg, 0.199 mmol) in anhydrous dichloromethane (3 mL) and carbon tetrachloride (2 mL) was added triphenylphosphine (175 mg, 0.667 mmol). The reaction mixture was stirred at reflux for three hours then at room temperature overnight to give a dark brown solution containing 3-chloro-2-(5-fluoro-6-methoxybenzothiazol-2-yl)-3-furan-2-ylacrylonitrile. Hydrazine monohydrate (30 μL, 0.62 mmol) and methanol (1 mL) were then added and the solution was refluxed for 2 hrs. At this point, conc. HCl (0.7 mL) was added and the solution was refluxed for an additional hour. The mixture was then cooled to room temperature and neutralized with ammonium hydroxide. The solvent was evaporated and the crude product was purified by flash column chromatography eluting with CH2Cl2:MeOH=9:1 to yield 15 mg (21%) of the title compound as a brown solid. MS (m/z, ES+): 331.1 (M+1, 100%).

1. temperatureat reflux for three hours
2. customat room temperature overnight to give a dark brown solution
3. temperaturethe solution was refluxed for 2 hrs
4. temperaturethe solution was refluxed for an additional hour
5. customThe solvent was evaporated
6. customthe crude product was purified by flash column chromatography
7. washeluting with CH2Cl2