反应详情

温度

-20 °C

To a solution of 2-fluoro-6-(4'-trifluoromethyl-phenyl)pyridine (2.4 g, 10 mmol, prepared according to example 17) in dry THF (35 mL) is added dropwise a solution of 2M LDA in THF (7.5 mL, 15 mmol) at -70° C. After 2 hours at -70° C. dimethyl disulfide (1.41 g, 15 mmol) is added and the reaction mixture is allowed to warm at -20 ° C. The mixture is hydrolysed and extracted with diethylether. After separation the organic layer is dried with anhydrous magnesium sulphate. The solvents are removed and the crude product is purified by flash column chromatography (silica gel). Elution with hexane/ethyl acetate (20/1 v/v) gives the title compound (1.2 g, 42%) with mp 70°-73° C.

1. extractionextracted with diethylether
2. customAfter separation the organic layer
3. dry with materialis dried with anhydrous magnesium sulphate
4. customThe solvents are removed
5. customthe crude product is purified by flash column chromatography (silica gel)
6. washElution with hexane/ethyl acetate (20/1 v/v)