反应详情

1-[2-(4-Benzyloxyphenoxy)ethyl]-4-hydroxy4-(4-methylbenzyl) piperidine hydrochloride. A mixture of 2-(4-benzyloxyphenoxy)ethyl bromide (368 mg, 1.2 mmol), 4(4-methylbenzyl)4hydroxypiperidine hydrochloride (290 mg, 1.2 mmol), potassium carbonate (414 mg, 3 mmol) in 30 mL of acetonitrile was allowed to reflux for 12 h. The inorganic salt was removed through a short column of silica gel and washed with ethyl acetate (3×25 mL). The combined filtrate was evaporated in vacuo to give a crude mixture, which was purified by flash chromatography (5% methanol in ethyl acetate), giving a pale yellow oil, which was dissolved into methanol (10 mL), to which was added 4 mL of 1 M HCl in methanol. The resulting solution was allowed to stir at rt for 10 min, and methanol was evaporated in vacuo to give a residue, to which 50 mL of ether was added. The resulting mixture was stirred overnight. A white solid was collected by filtration and dried in vacuo, giving 420 mg (75%) of the title product: mp 179-181° C.

1. temperatureto reflux for 12 h
2. customThe inorganic salt was removed through a short column of silica gel
3. washwashed with ethyl acetate (3×25 mL)
4. customThe combined filtrate was evaporated in vacuo
5. customto give a crude mixture, which
6. customwas purified by flash chromatography (5% methanol in ethyl acetate)
7. customgiving a pale yellow oil, which
8. custommethanol was evaporated in vacuo
9. customto give a residue
10. stirringThe resulting mixture was stirred overnight
11. filtrationA white solid was collected by filtration
12. customdried in vacuo