反应详情

To a mixture of 2-(3,4-difluorobenzyl)-5-[3-methoxy-4-(2-methyl-1,3-oxazol-5-yl)phenyl]-1,3,4-oxadiazole (2.41 g) in DMF (45 mL) was added sodium hydride (60%, 264 mg) at 0° C., and the mixture was stirred for 10 min. tert-Butyl [2-chloro-1-(iodomethyl)ethoxy]dimethylsilane (2.52 g) was added to the reaction mixture, and the mixture was stirred at room temperature for 30 min. Saturated aqueous ammonium chloride solution was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane). To a mixture of the purified product in DMSO (7.6 mL) was added sodium azide (199 mg), and the mixture was stirred at 100° C. for 10 hr. The reaction mixture was diluted with ethyl acetate/brine, and the mixture was extracted with ethyl acetate. The extract was dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate). To a mixture of the purified product in THF (46 mL) were added diphenylphosphino-polystyrene (1.99 mmol/g, 4.58 g) and water (4.6 mL), and the mixture was stirred at 80° C. for 2 hr. The reaction mixture was allowed to cool to room temperature, the precipitate was filtered off, and the filtrate was evaporated under reduced pressure. Toluene (46 mL) was added to the residue, and the mixture was stirred under heating with reflux for 1 hr. The reaction mixture was concentrated, and the residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound (415 mg).

1. additionwas added to the reaction mixture
2. extractionthe mixture was extracted with ethyl acetate
3. dry with materialThe extract was dried over anhydrous magnesium sulfate
4. customthe solvent was evaporated under reduced pressure
5. customThe residue was purified by silica gel column chromatography (ethyl acetate/hexane)
6. additionTo a mixture of the purified product in DMSO (7.6 mL)
7. additionwas added sodium azide (199 mg)
8. stirringthe mixture was stirred at 100° C. for 10 hr
9. additionThe reaction mixture was diluted with ethyl acetate/brine
10. extractionthe mixture was extracted with ethyl acetate
11. dry with materialThe extract was dried over anhydrous magnesium sulfate
12. customthe solvent was evaporated under reduced pressure
13. customThe residue was purified by silica gel column chromatography (ethyl acetate)
14. additionTo a mixture of the purified product in THF (46 mL)
15. additionwere added diphenylphosphino-polystyrene (1.99 mmol/g, 4.58 g) and water (4.6 mL)
16. stirringthe mixture was stirred at 80° C. for 2 hr
17. temperatureto cool to room temperature
18. filtrationthe precipitate was filtered off
19. customthe filtrate was evaporated under reduced pressure
20. additionToluene (46 mL) was added to the residue
21. stirringthe mixture was stirred
22. temperatureunder heating
23. temperaturewith reflux for 1 hr
24. concentrationThe reaction mixture was concentrated
25. customthe residue was purified by silica gel column chromatography (ethyl acetate/hexane)