(3R)-1-(tert-butoxycarbonyl)-3-((3-fluorophenoxy)benzoyl)piperidine → (R)-tert-butyl 3-((S)-1-(2-(3-fluorophenoxy)phenyl)-1-hydroxy-5-methoxypentyl)piperidine-1-carboxylate
反応式
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH2:11][C@@H:10]([C:14](=[O:29])[C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][C:16]=2[O:21][C:22]2[CH:27]=[CH:26][CH:25]=[C:24]([F:28])[CH:23]=2)[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH3:30][O:31][CH2:32][CH2:33][CH2:34][CH2:35][Mg]Cl>C1COCC1>[F:28][C:24]1[CH:23]=[C:22]([CH:27]=[CH:26][CH:25]=1)[O:21][C:16]1[CH:17]=[CH:18][CH:19]=[CH:20][C:15]=1[C@:14]([C@@H:10]1[CH2:11][CH2:12][CH2:13][N:8]([C:6]([O:5][C:1]([CH3:4])([CH3:2])[CH3:3])=[O:7])[CH2:9]1)([OH:29])[CH2:35][CH2:34][CH2:33][CH2:32][O:31][CH3:30]参加物
4
実験手順
To a solution of (3R)-1-(tert-butoxycarbonyl)-3-((3-fluorophenoxy)benzoyl)piperidine (0.95 g, 2.37 mmol) in THF (3 mL) at −20° C. was added 1.45 M 4-methoxybutyl magnesium chloride in THF (3.3 mL, 4.76 mmol) dropwise. The resulting solution was warmed to rt slowly, and the completion of reaction was confirmed by LC-MS (˜20 min). The reaction was quenched with sat'd aq NH4Cl (4 mL) and extracted with Et2O (4×5 mL). The combined organic layers were washed with water and brine, and the solvent was removed in vacuo to give a crude product which was purified by flash column chromatography to afford (R)-tert-butyl 3-((S)-1-(2-(3-fluorophenoxy)phenyl)-1-hydroxy-5-methoxypentyl)piperidine-1-carboxylate (0.50 g, 43%).