反应详情

Trifluoroacetic acid (0.5 ml) was added dropwise to a solution of N-(2-(3-methoxyphenyl)ethyl)-4-(2-(1-hydroxyethyl)-5-methoxybenzyl)piperidine (250 mg, 0.65 mmol) and triethylsilane (91 mg, 0.78 mmol) in dichloromethane (5 ml) under ice-cooling, and the reaction mixture was stirred as it was for 2 hours. Ethyl acetate and a saturated aqueous sodium hydrogencarbonate solution were added thereto to effect separation, and the organic layer was washed with a saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, and then distilled under reduced pressure to remove the solvent. The residue was purified by a silica gel column chromatography (chloroform/methanol=50/1) to obtain a mixture of N-(2-(3-methoxyphenyl)ethyl)-4-(2-ethyl-5-methoxybenzyl)piperidine and triethylsilanol. This mixture was dissolved in dichloromethane (5 ml), followed by adding thereto a 1N hydrogen chloride-diethyl ether solution (1 ml, 1 mmol), and the solvent was distilled off under reduced pressure. The residue was suspended in diethyl ether and the precipitate was collected by filtration and washed with diethyl ether to obtain the title compound (209 mg, 79%) as white powder.

1. temperaturecooling
2. customseparation
3. washthe organic layer was washed with a saturated aqueous sodium chloride solution
4. dry with materialdried over anhydrous sodium sulfate
5. distillationdistilled under reduced pressure
6. customto remove the solvent
7. customThe residue was purified by a silica gel column chromatography (chloroform/methanol=50/1)
8. customto obtain
9. additionby adding
10. filtrationthe precipitate was collected by filtration
11. washwashed with diethyl ether