[N-:1]=[N+:2]=[N-:3].[Na+].[CH3:5][O:6][C:7](=[O:23])[C:8]1[CH:13]=[CH:12][C:11]([CH2:14]Br)=[CH:10][C:9]=1[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][C:17]=1[CH3:22]>CN(C=O)C.CCOC(C)=O>[CH3:5][O:6][C:7](=[O:23])[C:8]1[CH:13]=[CH:12][C:11]([CH2:14][N:1]=[N+:2]=[N-:3])=[CH:10][C:9]=1[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][C:17]=1[CH3:22]To a stirred mixture at 0° C. under N2 of sodium azide (1.47 g, 22.6 mmol) in anhydrous DMF (30 mL) was added a solution of 4-bromomethyl-2-(2-methylphenyl)benzoic acid methyl ester (6.00 g, 18.8 mmol), prepared as in Example 1178A-D, in anhydrous DMF (10 mL). Reaction stirred overnight at room temperature. Reaction diluted with EtOAc and washed with water and brine. Organic layer dried with Na2SO4, filtered, and concentrated in vacuo.
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