Formaldehyde → 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazol-3-yl]-2-methylamino-N-(2,2,2-trifluoroethyl) benzoic acid amide

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In a solution of 0.25 g of 2-amino-4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazol-3-yl]-N-(2,2,2-trifluoroethyl)benzoic acid amide (Compound of the present invention No. 5-329) synthesized in Synthetic Example 12 and 0.06 g of 36% formaldehyde aqueous solution in 7 ml of 1,2-dichloroethane, 1.00 g of sodium triacetoxy borohydride was added with stirring at room temperature in three portions at 1 hour-interval, and continued to stir at the same temperature for further 2 hours. After the completion of the reaction, the reaction mixture was poured to 5 ml of ice water, the organic phase was collected, and the solvent was distilled under reduced pressure. The residue was subjected to purification with medium-pressure preparative liquid chromatography (Yamazen Corporation, medium pressure preparative system; YFLC-Wprep) that was eluted with ethyl acetate-hexane (0:1 to 1:3 gradient), and 0.13 g of 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazol-3-yl]-2-methylamino-N-(2,2,2-trifluoroethyl)benzoic acid amide was obtained as pale yellow crystal, and 0.13 g of 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazol-3-yl]-2-dimethylamino-N-(2,2,2-trifluoroethyl)benzoic acid amide was obtained as pale yellow resinous substance.

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