[Cl:1][C:2]1[C:3]([N:8]2[C:12]([C:13]([O:15][CH3:16])=[O:14])=[CH:11][C:10]([CH:17]=[O:18])=[N:9]2)=[N:4][CH:5]=[CH:6][CH:7]=1.O.O.P([O-])(O)(O)=[O:22].[Na+].Cl([O-])=O.[Na+].CC(=CC)C>C(O)(C)(C)C.O>[Cl:1][C:2]1[C:3]([N:8]2[C:12]([C:13]([O:15][CH3:16])=[O:14])=[CH:11][C:10]([C:17]([OH:22])=[O:18])=[N:9]2)=[N:4][CH:5]=[CH:6][CH:7]=12.00 g (7.53 mmol) of methyl 1-(3-chloropyridin-2-yl)-3-formyl-1H-pyrazole-5-carboxylate were dissolved in 18 ml of tert-butanol, and 5 ml of water were then added. After cooling to 0° C., 2.35 g (15.1 mmol) sodium dihydrogenphosphate dihydrate, 2.73 g (30.1 mmol) of sodium chlorite and 3.17 g (45.2 mmol) of 2-methyl-2-butene were added in succession. After 1 hour at 20° C., water was added and the mixture was extracted twice with ethyl acetate. The combined organic phases were dried over sodium sulphate and the solvent was removed under reduced pressure (logP: 1.38)
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