[OH:1][CH:2]1[CH2:5][N:4](C(OC(C)(C)C)=O)[CH2:3]1.C1COCC1.[H-].[Na+].[CH2:20](Br)[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1>CCOC(C)=O.O>[CH2:20]([O:1][CH:2]1[CH2:3][NH:4][CH2:5]1)[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1tert-Butyl 3-hydroxyazetidine-1-carboxylate (3.0 g) was mixed with THF (30 ml), and sodium hydride (55% suspended in oil) (600 mg) was added thereto, followed by stirring at room temperature for 10 minutes. Benzyl bromide (2.5 ml) was added thereto, followed by stirring at room temperature for 3 hours. Water and EtOAc were added to the reaction mixture, and the organic layer was dried over Na2SO4 and concentrated under reduced pressure. The obtained residue was mixed with DCE (30 ml), and TFA (15 g) was added thereto, followed by stirring at room temperature for 3 hours. The reaction mixture was concentrated under reduced pressure and purified by basic silica gel column chromatography (CHCl3/MeOH) to obtain 3-(benzyloxy)azetidine (2.2 g).
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