反应详情

2,6-Dichloro-N-hydroxybenzenecarboximidoyl chloride (1.25 g, 5.6 mmol) and 2,2-dichloro-N-(2-ethynylphenyl)acetamide (1.93 g, 8.5 mmol) were dissolved in anhydrous tetrahydrofuran (40 mL) and triethylamine (1.0 mL). The mixture was stirred at room temperature for 1 h then heated at reflux for 4 h to generate the 2,6-dichlorophenyl nitrile oxide intermediate, which reacted by a 1,3-dipolar cycloaddition reaction with 2,2-dichloro-N-(2-ethynylphenyl)acetamide. The solvent was removed under reduced pressure. The residue was dissolved in ethyl acetate and washed successively with water and brine. The ethyl acetate solution was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting solid was purified by column chromatography on silica gel, eluting with 8:2 hexanes-ethyl acetate. The appropriate fractions were combined to give 2,2-dichloro-N-[2-[3-(2,6-dichlorophenyl)-5-isoxazolyl]phenyl]acetamide as a light brown solid, 1.24 g.

1. temperaturethen heated
2. temperatureat reflux for 4 h
3. customThe solvent was removed under reduced pressure
4. dissolutionThe residue was dissolved in ethyl acetate
5. washwashed successively with water and brine
6. dry with materialThe ethyl acetate solution was dried over anhydrous sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customThe resulting solid was purified by column chromatography on silica gel
10. washeluting with 8:2 hexanes-ethyl acetate