Water → 5-(Chloromethyl)-2,2-difluorobenzo[d][1,3]dioxole

Participants

Reaction Conditions

Reaction Steps

(2,2-difluoro-1,3-benzodioxol-5-yl)-methanol (1.0 eq) was dissolved in MTBE (5 vol). A catalytic amount of 4-(N,N-dimethyl)aminopyridine (DMAP) (1 mol %) was added and SOCl2 (1.2 eq) was added via addition funnel. The SOCl2 was added at a rate to maintain the temperature in the reactor at 15-25° C. The temperature was increased to 30° C. for 1 h, and then was cooled to 20° C. Water (4 vol) was added via addition funnel while maintaining the temperature at less than 30° C. After stirring for an additional 30 min, the layers were allowed to separate. The organic layer was stirred and 10% (w/v) aq NaOH (4.4 vol) was added. After stirring for 15 to 20 min, the layers were allowed to separate. The organic phase was then dried (Na2SO4), filtered, and concentrated to afford crude 5-chloromethyl-2,2-difluoro-1,3-benzodioxole that was used directly in the next step.

Provenance & Evidence