反应详情

To a solution of 3-bromo-5-{6-[2-(2-ethoxycarbonyl-ethyl)-3-(3-ethoxycarbonyl-propoxy)-phenyl]-hexyloxy}-benzoic acid (808 mg, 1.33 mmol), bromotripyrrolidinophosphonium hexafluorophosphate (PyBroP) (745 mg, 1.6 mmol) in dichloromethane (15 mL) were added dimethylamine in THF (800 μL, 1.6 mmol, 2 M solution) and DIPEA (463 μL, 2.66 mmol) at room temperature. The resulting clear solution was stirred for 36 h. Then, the reaction mixture was diluted with water (100 mL) and dichloromethane (50 mL). The two layers were separated and the aqueous layer was extracted with dichloromethane (50 mL). The combined organic extracts were washed with brine solution (200 mL) and dried over anhydrous magnesium sulfate. Filtration of the drying agent and concentration of the filtrate in vacuo gave the crude product which was purified by using an ISCO™ (40 g) column chromatography eluting with 40-60% ethyl acetate in hexanes to afford 4-{3-[6-(3-bromo-5-dimethylcarbamoyl-phenoxy)-hexyl]-2-(2-ethoxycarbonyl-ethyl)-phenoxy}-butyric acid ethyl ester (757 mg, 90%) as a colorless oil

1. customThe two layers were separated
2. extractionthe aqueous layer was extracted with dichloromethane (50 mL)
3. washThe combined organic extracts were washed with brine solution (200 mL)
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationFiltration of the drying agent and concentration of the filtrate in vacuo
6. customgave the crude product which
7. customwas purified
8. washeluting with 40-60% ethyl acetate in hexanes