反应详情

温度

20 °C

Commercially available 2,2-difluoro-1,3-benzodioxole-5-carboxylic acid (1.0 eq) is slurried in toluene (10 vol). Vitride® (2 eq) is added via addition funnel at a rate to maintain the temperature at 15-25° C. At the end of addition the temperature is increased to 40° C. for 2 h then 10% (w/w) aq. NaOH (4.0 eq) is carefully added via addition funnel maintaining the temperature at 40-50° C. After stirring for an additional 30 minutes, the layers are allowed to separate at 40° C. The organic phase is cooled to 20° C. then washed with water (2×1.5 vol), dried (Na2SO4), filtered, and concentrated to afford crude (2,2-difluoro-1,3-benzodioxol-5-yl)-methanol that is used directly in the next step.

1. additionAt the end of addition the temperature
2. temperatureis increased to 40° C. for 2 h
3. temperaturemaintaining the temperature at 40-50° C
4. customto separate at 40° C
5. temperatureThe organic phase is cooled to 20° C.
6. washthen washed with water (2×1.5 vol)
7. dry with materialdried (Na2SO4)
8. filtrationfiltered
9. concentrationconcentrated