CS(O[CH2:6][CH:7]1[CH2:12][CH2:11][N:10]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:9][CH2:8]1)(=O)=O.[N-:20]=[N+:21]=[N-:22].[Na+]>CN(C)C=O>[N:20]([CH2:6][CH:7]1[CH2:12][CH2:11][N:10]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:9][CH2:8]1)=[N+:21]=[N-:22]Tertiary butyl 4-((methylsulfonyloxy)methyl)piperidine-1-carboxylate (48 g, 163.6 mmol) was dissolved in dimethylformamide (500 mL) and sodium azide (19.15 g, 295 mmol) was added thereto, followed by stirring at 120° C. for 6 hours. After the reaction was completed, the reactants were cooled to room temperature, extracted with ethyl acetate and water, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure to afford the title compound (35 g, 89%).
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