反应详情

In a solution of 0.25 g of 2-amino-4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazole-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-dihydroisoxazole-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-dihydroisoxazole-3-yl]-2-dimethylamino-N-(2,2,2-trifluoroethyl)benzoic acid amide was obtained as pale yellow resinous substance. 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazole-3-yl]-2-methylamino-N-(2,2,2-trifluoroethyl)benzoic acid amide;

1. additionwas added
2. stirringto stir at the same temperature for further 2 hours
3. customAfter the completion of the reaction
4. customthe organic phase was collected
5. distillationthe solvent was distilled under reduced pressure
6. customThe residue was subjected to purification with medium-pressure preparative liquid chromatography (Yamazen Corporation, medium pressure preparative system; YFLC-Wprep) that
7. washwas eluted with ethyl acetate-hexane (0:1 to 1:3 gradient)