反应详情

To a stirred solution of 2,4-dimethyl-thiazole-5-carboxylic acid (650 mg, 7.0 mmol) in THF (33 mL) at −70° C. and under argon was added BuLi (1.6M in hexanes, 4.94 mL, 7.9 mmol) dropwise. After 2 h a solution of 3-(5-fluoro-pyridin-2-yl)-5-methyl-isoxazole-4-carbaldehyde (814 mg, 3.95 mmol) in THF (12 mL) was added dropwise. After 2 h the reaction mixture was quenched with citric acid solution (5%, 25 mL) then warmed to room temperature and extracted with ethyl acetate. The combined extracts were washed with brine, water, dried over sodium sulfate, filtered and concentrated. Purification by recrystallization (ethyl acetate) afforded the title compound (729 mg, 51%) as a light yellow solid. MS: m/e=362.2 [M+H]+.

1. customAfter 2 h the reaction mixture was quenched with citric acid solution (5%, 25 mL)
2. extractionextracted with ethyl acetate
3. washThe combined extracts were washed with brine, water
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. customPurification
8. customby recrystallization (ethyl acetate)