[CH3:1][O:2][C:3](=[O:8])[CH2:4][N:5]=[N+:6]=[N-:7].[F:9][C:10]1[C:17]([O:18][CH2:19][C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)=[CH:16][CH:15]=[CH:14][C:11]=1[CH:12]=O.C[O-].[Na+]>CO>[CH3:1][O:2][C:3](=[O:8])[C:4]([N:5]=[N+:6]=[N-:7])=[CH:12][C:11]1[CH:14]=[CH:15][CH:16]=[C:17]([O:18][CH2:19][C:20]2[CH:21]=[CH:22][CH:23]=[CH:24][CH:25]=2)[C:10]=1[F:9]A mixture of methylazidoacetate (36.64 g) and 2-Fluoro-3-benzyloxy benzaldehyde (18.32 g) in methanol (250 ml) was added dropwise, with stirring, over 1 hour to a mixture of sodium methoxide (17.20 g) in methanol (100 ml) at −25° C. under a stream of argon. Mixture was left to stir for 20 minutes, allowed to warm to 5° C. and stirred overnight.
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