CC1C=CC(S(O[CH2:12][C@@H:13]([NH:21][C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:14][C@H:15]2[CH2:20][CH2:19][CH2:18][O:17][CH2:16]2)(=O)=O)=CC=1.[N-:29]=[N+:30]=[N-:31].[Na+]>CN(C=O)C.CCOC(C)=O>[N:29]([CH2:12][C@@H:13]([NH:21][C:22](=[O:23])[O:24][C:25]([CH3:28])([CH3:27])[CH3:26])[CH2:14][C@H:15]1[CH2:20][CH2:19][CH2:18][O:17][CH2:16]1)=[N+:30]=[N-:31]The solution of (S)-2-(tert-butoxycarbonylamino)-3-((R)-tetrahydro-2H-pyran-3-yl)propyl 4-methylbenzenesulfonate (132 mg, 0.32 mmol) and NaN3 (62 mg, 0.95 mmol) in anhydrous DMF was heated to 80° C. under N2 atmosphere for 1.5 hr, cooled to rt and diluted with EtOAc, and washed with H2O (3×20 mL), followed by brine, and dried over anhydrous Na2SO4, and filtered, and concentrated under reduced pressure. The resulted slurry was purified through flash chromatography on silica gel (eluted with gradient system: 0-30% EtOAc in hexane) to afford tert-butyl (S)-1-azido-3-((R)-tetrahydro-2H-pyran-3-yl)propan-2-ylcarbamate 58 mg, yield 64%. MS ESI+ve m/z 307 (M+Na).
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