反应详情

温度

50 °C

HCl (4M in dioxan, 4.22 mL, 16.88 mmol) was added in one portion to a stirred suspension of tert-butyl 4-(6-chloropyridin-3-yl)-4-hydroxypiperidine-1-carboxylate (1.32 g, 4.22 mmol) in ethyl acetate (20 mL) at ambient temperature. The resulting mixture was stirred at 50° C. for 90 minutes then cooled to room temperature, diluted with ether (20 mL) and filtered. The filtered solid was washed with ether and dried then taken up in methanol, applied to an SCX column and eluted with methanol followed by 2M ammonia in methanol. Product-containing fractions were combined and evaporated then purified by flash silica chromatography, elution gradient 10 to 20% 2M ammonia in methanol in DCM. Pure fractions were evaporated to dryness to afford 4-(6-chloropyridin-3-yl)piperidin-4-ol (0.43 g, 48%) as a pale orange solid.

1. temperaturethen cooled to room temperature
2. filtrationfiltered
3. washThe filtered solid was washed with ether
4. customdried
5. washeluted with methanol
6. customevaporated
7. customthen purified by flash silica chromatography, elution gradient 10 to 20% 2M ammonia in methanol in DCM
8. customPure fractions were evaporated to dryness