[Br:1][C:2]1[CH:9]=[CH:8][C:5]([CH2:6]Br)=[CH:4][CH:3]=1.[N-:10]=[N+:11]=[N-:12].[Na+]>CS(C)=O.CCOC(C)=O>[N:10]([CH2:6][C:5]1[CH:8]=[CH:9][C:2]([Br:1])=[CH:3][CH:4]=1)=[N+:11]=[N-:12]To a solution of 4-bromobenzylbromide 1 (2.95 g, 11.8 mmol) in DMSO (5 mL) at room temperature, was added NaN3 (1.53 g, 23.5 mmol). The solution was heated to 80° C. and stirred for 1 h at this temperature. The reaction mixture was diluted with EtOAc, and washed with H2O and brine. The organic layer was dried over anhydrous Na2SO4, concentrated under reduced pressure, and the residue was purified by silica gel column chromatography using EtOAc/hexanes (10%) to give 1.88 g (76%) of 2 as a colorless oil. 1H NMR spectra was consistent with literature data. Shi, H.; Liu, J.; Geng, J.; Tang, B. Z.; Liu, B. J. Am. Chem. Soc. 2012, 134, 9569.
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