反应详情

In a solution of 1.25 g of 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazol-3-yl]-2-methyl benzoic acid amide synthesized in Step 1 of Synthetic Example 19 and 0.32 g of 2,3-dihydrofuran in 30 mL of dichloromethane, 0.01 g of p-toluene sulfonic acid monohydrate was added at room temperature with stirring, and stirred at room temperature for 3 days. After the completion of the reaction, 30 mL of saturated sodium hydrogen carbonate aqueous solution was added in the reaction mixture, extracted with ethyl acetate (30 mL×2), the organic phase was dehydrated with and dried over saturated sodium chloride aqueous solution and then anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified with silica gel column chromatography that was eluated with ethyl acetate-hexane (1:1) to obtain 1.18 g of the aimed product as colorless resinous substance.

1. stirringstirred at room temperature for 3 days
2. additionwas added in the reaction mixture
3. extractionextracted with ethyl acetate (30 mL×2)
4. dry with materialdried over saturated sodium chloride aqueous solution
5. distillationanhydrous sodium sulfate, and the solvent was distilled off under reduced pressure
6. customThe residue was purified with silica gel column chromatography that