反应详情

To a solution of 2-fluoro-4-iodo-benzaldehyde (17.40 g, 69.60 mmol) in anhydrous tetrahydrofuran (300 mL) at −10° C. under an atmosphere of nitrogen was added 3.0 M methylmagnesium chloride in tetrahydrofuran (27.84 mL, 83.52 mmol) via syringe at such a rate as to maintain the temperature of the reaction mixture below 0° C. The reaction was stirred for 30 minutes while warming to room temperature. Saturated aqueous ammonium chloride solution was added and the mixture was diluted with ethyl acetate (200 mL). The organic layer was separated and the aqueous layer was extracted with ethyl acetate (2×50 mL). The organic extracts were combined, washed with water (1×50 mL), brine, dried over sodium sulfate, filtered and concentrated in vacuo. The crude product was purified by chromatography over silica gel gradient eluted with 15 to 40% v/v ethyl acetate/hexanes to give 1-(2-fluoro-4-iodo-phenyl)-ethanol (15.50 g, 84%).

1. temperatureto maintain the temperature of the reaction mixture below 0° C
2. customThe organic layer was separated
3. extractionthe aqueous layer was extracted with ethyl acetate (2×50 mL)
4. washwashed with water (1×50 mL), brine
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe crude product was purified by chromatography over silica gel gradient
9. washeluted with 15 to 40% v/v ethyl acetate/hexanes