反应详情

Add piperidine (3.04 g, 36.11 mmol) to a solution of Methanesulfonic acid 2-[2-(4-bromo-phenyl)-5-methyl-oxazol-4-yl]-ethyl ester (See Intermediate 13) (1.3 g, 3.61 mmol) in anhydrous THF (15 mL). Reflux the reaction overnight and cool. Wash organic material with 1N HCl (50 mL) and extract aqueous layer with diethyl ether (2×50 mL). Add 5N NaOH to aqueous layer (pH>10) and extract with dichoromethane (2×50 mL). Dry organics over Na2SO4, filter and concentrate. Purify crude on silica gel, eluting with 5% 2N NH3 in methanol/dichloromethane to give 1-{2-[2-(4-bromo-phenyl)-5-methyl-oxazol-4-yl]-ethyl}-piperidine (0.944 g, 75%).

1. temperatureReflux
2. customthe reaction overnight
3. temperaturecool
4. extractionWash organic material with 1N HCl (50 mL) and extract aqueous layer with diethyl ether (2×50 mL)
5. additionAdd 5N NaOH to aqueous layer (pH>10)
6. extractionextract with dichoromethane (2×50 mL)
7. filtrationDry organics over Na2SO4, filter
8. concentrationconcentrate
9. customPurify crude on silica gel
10. washeluting with 5% 2N NH3 in methanol/dichloromethane