[F:1][H-]F.[K+].CCCC[N+](CCCC)(CCCC)CCCC.F.F.[F-].[CH2:25]([O:32][CH2:33][C:34]12[O:40][CH:39]1[CH2:38][N:37]([C:41]([O:43][C:44]([CH3:47])([CH3:46])[CH3:45])=[O:42])[CH2:36][CH2:35]2)[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1>C(Cl)(Cl)Cl>[CH2:25]([O:32][CH2:33][C:34]1([OH:40])[CH2:35][CH2:36][N:37]([C:41]([O:43][C:44]([CH3:47])([CH3:46])[CH3:45])=[O:42])[CH2:38][CH:39]1[F:1])[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1Potassium bifluoride (1.22 g) and tetrabutylammonium dihydrogentrifluoride (472 mg) were added to tert-butyl 6-[(benzyloxy) methyl]-7-oxa-3-azabicyclo[4.1.0]heptane-3-carboxylate (2.50 g), followed by heating and stirring at 120° C. for 2 days. The reaction was diluted with chloroform and filtered through Celite. The residue obtained by concentration of the solvent under reduced pressure was purified by silica gel column chromatography (EtOAc/hexane) to obtain tert-butyl 4-[(benzyloxy)methyl]-3-fluoro-4-hydroxypiperidine-1-carboxylate (1.76 g).
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