反应详情

6-(4-Bromo-2-chloro-phenylamino)-7-fluoro-3-(2-methanesulfonyl-ethyl)-3H-benzoimidazole-5-carbaldehyde 10z (0.025 g, 0.053 mmol) is suspended in MeOH (2 mL) and K2CO3 (0.015 g, 0.105 mmol) is added followed by tosylmethyl isocyanide (0.011 g, 0.058 mmol). The reaction mixture is heated to reflux under N2 for 16 hours. After cooling, additional tosylmethyl isocyanide (0.011 g, 0.058 mmol) is added and the reaction mixture heated to reflux under N2 for 16 hours. The reaction mixture is cooled to room temperature, concentrated under reduced pressure and dissolved in ethyl acetate. The organic solution is washed with water and brine. The combined aqueous washes are extracted with ethyl acetate. The combined organic extracts are dried (Na2SO4) and concentrated under reduced pressure. Purification by flash column chromatography eluted with 20:1 methylene chloride:MeOH gives 4 mg (18%) desired product 10x and 1 mg (4%) (4-bromo-2-chloro-phenyl)-[4-fluoro-1-(2-methanesulfonyl-ethyl)-6-oxazol-5-yl-1H-benzoimidazol-5-yl]-amine.

1. temperatureThe reaction mixture is heated
2. temperatureto reflux under N2 for 16 hours
3. temperatureAfter cooling
4. temperaturethe reaction mixture heated
5. temperatureto reflux under N2 for 16 hours
6. concentrationconcentrated under reduced pressure
7. dissolutiondissolved in ethyl acetate
8. washThe organic solution is washed with water and brine
9. extractionThe combined aqueous washes are extracted with ethyl acetate
10. dry with materialThe combined organic extracts are dried (Na2SO4)
11. concentrationconcentrated under reduced pressure
12. customPurification by flash column chromatography
13. washeluted with 20:1 methylene chloride