反应详情

温度

0 °C

At −10° C., 0.84 ml of thionyl chloride are added to 2.9 g of 3-[1-(2-fluoro-5-trifluoromethylphenyl)-cyclopropyl]-2-oxo-propionic acid in 15 ml dimethylacetamide. The mixture is stirred for 30 min. at −10° C. and for 1 hour at 0° C. and then added to 1.95 g of 5-aminophthalide (or, vice versa, 5-aminophthalide may be added to the mixture). After 16 hours at ambient temperature, 2 M hydrochloric acid and ethyl acetate are added, the organic phase is washed to neutral with water, dried over sodium sulfate and concentrated. After chromatography on silica gel (hexane/ethyl acetate: 1+1) and recrystallization from diisopropyl ether, 2.4 g of 5-{3-[1-(2-fluoro-5-trifluoromethylphenyl)-cyclopropyl]-2-oxo-propionylamino}-phthalide (m.p. 168° C.) are obtained.

1. additionmay be added to the mixture)
2. waitAfter 16 hours at ambient temperature
3. washthe organic phase is washed to neutral with water
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated
6. customAfter chromatography on silica gel (hexane/ethyl acetate: 1+1) and recrystallization from diisopropyl ether, 2.4 g of 5-{3-[1-(2-fluoro-5-trifluoromethylphenyl)-cyclopropyl]-2-oxo-propionylamino}-phthalide (m.p. 168° C.)
7. customare obtained