反应详情

5-Amino-4-chloro-3-methylisothiazole (7.4 g, 0.050 mol) was added to a suspension of sodium methoxide (6.1 g, 0.112 mol) in tetrahydrofuran (160 ml) and the mixture was stirred at room temperature for 20 minutes. A solution of methyl 2-(4-methoxyphenyl)propionate (8.8 g, 0.045 mol) in tetrahydrofuran (40 ml) was added dropwise and the mixture was stirred for 3 hours at room temperature. The reaction was quenched with water, acidified with dilute aqueous hydrochloric acid and extracted with ethyl acetate. The organic extract was washed with brine, dried over anhydrous magnesium sulfate, filtered and the filtrate was evaporated in vacuo. The residue was purified by flash column chromatography on silica gel, eluting with ethyl acetate:dichloromethane 2.5:97.5, to give N-(4-chloro-3-methylisothiazol-5-yl)-2-(4-methoxyphenyl)propionamide (12.5 g) as a colourless solid.

1. stirringthe mixture was stirred for 3 hours at room temperature
2. customThe reaction was quenched with water
3. extractionextracted with ethyl acetate
4. extractionThe organic extract
5. washwas washed with brine
6. dry with materialdried over anhydrous magnesium sulfate
7. filtrationfiltered
8. customthe filtrate was evaporated in vacuo
9. customThe residue was purified by flash column chromatography on silica gel
10. washeluting with ethyl acetate:dichloromethane 2.5:97.5