反应详情

To a mixed solution of 150 ml of DMF, 12.7 g of 2-chloro-4,5-difluorobenzoic acid 2-propynyl ester and 3.4 g of propargyl alcohol, 2.4 g of 60% sodium hydride (oily) was added under ice cooling. After stirring at room temperature overnight, the reaction mixture was added with hydrochloric acid and extracted with ethyl acetate. The obtained organic layer was washed in turn with water and saturated brine, dried over magnesium sulfate and then concentrated under reduced pressure. The obtained residue was subjected to silica gel column chromatography, and 19 g of 2-chloro-5-fluoro-4-(2-propynyloxy)benzoic acid 2-propynyl ester was obtained.

1. extractionextracted with ethyl acetate
2. washThe obtained organic layer was washed in turn with water and saturated brine
3. dry with materialdried over magnesium sulfate
4. concentrationconcentrated under reduced pressure