Br[CH2:2][C:3]1[C:12]2[C:7](=[CH:8][CH:9]=[CH:10][CH:11]=2)[C:6]([C:13]([O:15][CH3:16])=[O:14])=[CH:5][CH:4]=1.[N-:17]=[N+:18]=[N-:19].[Na+]>CS(C)=O.O>[N:17]([CH2:2][C:3]1[C:12]2[C:7](=[CH:8][CH:9]=[CH:10][CH:11]=2)[C:6]([C:13]([O:15][CH3:16])=[O:14])=[CH:5][CH:4]=1)=[N+:18]=[N-:19]To a solution of methyl 4-(bromomethyl)-1-naphthoate (30 g, 0.107 mol) in anhydrous DMSO (300 mL) was added NaN3 portion wise (14 g, 0.215 mol) at 0° C. and stirred at rt for 16 h. Then the reaction mixture was diluted with water (500 mL), extracted with EtOAc (2×250 mL), washed with water, brine and dried over MgSO4. The solvent was removed under vacuum to give methyl 4-(azidomethyl)-1-naphthoate (20 g, 77%).
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