反应详情

温度

-75 °C

27 ml (43.3 mmol) of 1.6M butyllithium in hexane are added, at −75° C., to a solution of 11.4 g (43.3 mmol) of 3-allyl-2-fluoro-4-iodopyridine (prepared according to the process described in J.O.C., 1993, 58, pp. 7832) in 250 ml of THF. After 30 minutes' stirring at −75° C., a solution of 4.6 ml of 3-pentanone in 100 ml of THF is added dropwise. The reaction mixture is stirred for 6 hours at −75° C. After returning to room temperature, the mixture is hydrolysed with 100 ml of water and extracted with ethyl acetate. The organic phase is dried, concentrated and purified by chromatography over silica (eluant: cyclohexane/ethyl acetate 8/2) to yield the expected product.

1. customprepared
2. stirringThe reaction mixture is stirred for 6 hours at −75° C
3. customAfter returning to room temperature
4. extractionextracted with ethyl acetate
5. customThe organic phase is dried
6. concentrationconcentrated
7. custompurified by chromatography over silica (eluant: cyclohexane/ethyl acetate 8/2)