[CH3:1][O:2][C:3]([C:5]1[CH:9]=[C:8]([O:10][CH3:11])[N:7]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=2[F:18])[N:6]=1)=[O:4].[F:19][B-](F)(F)F.F[B-](F)(F)F.Cl[N+]12CC[N+](F)(CC1)CC2C.C(OCC)C.Cl>C(#N)C.O>[CH3:1][O:2][C:3]([C:5]1[C:9]([F:19])=[C:8]([O:10][CH3:11])[N:7]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=2[F:18])[N:6]=1)=[O:4]
200 mg (0.8 mmol) of 1-(2-fluoro-phenyl)-5-methoxy-1H-pyrazole-3-carboxylic acid methyl ester were dissolved in 2 ml of acetonitrile and 745 mg (1.99 mmol) of 1-chloro-methyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate) (Selectfluor®) were added. The mixture was stirred overnight. Then, irrespective of the incomplete reaction, diethyl ether, water and 2 N hydrochloric acid were added, the organic phase was separated, the solvent evaporated and the residue subjected to preparative HPLC. 70 mg (33%) of the title compound were obtained.
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