[F:1][C:2]1[C:13]([F:14])=[CH:12][CH:11]=[CH:10][C:3]=1[C:4](N(OC)C)=[O:5].[CH3:15][O:16][C:17]1[CH:22]=[CH:21][C:20]([Mg]Br)=[CH:19][CH:18]=1>>[F:1][C:2]1[C:13]([F:14])=[CH:12][CH:11]=[CH:10][C:3]=1[C:4]([C:20]1[CH:21]=[CH:22][C:17]([O:16][CH3:15])=[CH:18][CH:19]=1)=[O:5]Prepared according to Method A step B from 2,3-difluoro-N-methoxy-N-methylbenzamide (3.0 g, 15 mmol) and 4-methoxyphenylmagnesium bromide (35 mL, 0.5 M in THF) to give 1.44 g of the title compound as a white solid.
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