CC1C=CC(S(O[CH2:12][C@H:13]2[CH2:22][CH2:21][C:20]3[C:15](=[C:16]([C:24]4[CH:29]=[CH:28][CH:27]=[CH:26][C:25]=4[CH3:30])[C:17]([Cl:23])=[CH:18][CH:19]=3)[O:14]2)(=O)=O)=CC=1.[N-:31]=[N+:32]=[N-:33].[Na+]>CS(C)=O>[N:31]([CH2:12][C@H:13]1[CH2:22][CH2:21][C:20]2[C:15](=[C:16]([C:24]3[CH:29]=[CH:28][CH:27]=[CH:26][C:25]=3[CH3:30])[C:17]([Cl:23])=[CH:18][CH:19]=2)[O:14]1)=[N+:32]=[N-:33]To a solution of ((2R)-7-chloro-8-o-tolylchroman-2-yl)methyl 4-methylbenzenesulfonate (0.8 g, 1.8 mmol) in DMSO (50 mL) was added sodium azide (1.2 g, 18.4 mmol) and the resulting mixture was heated at 60° C. overnight. The mixture was extracted with ethyl acetate, washed with water and saturated sodium chloride, dried with anhydrous sodium sulfate and concentrated under reduced pressure. Purification by ISCO using a solvent gradient of 0 to 20% ethyl acetate in hexanes provided 0.5 g (88%) of (2R)-2-(azidomethyl)-7-chloro-8-o-tolylchroman as a colorless oil.
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