Methanesulfonyl chloride → (2R,3R)-2-(2,3-Difluorophenyl)-1,3-bis(methanesulfonyloxy)-2-butanol

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Reaction Steps

5.71 g (50 mmol) of methanesulfonyl chloride were added to a solution of 3.51 g (16.1 mmol) of (2R,3 R)-2-(2,3-difluorophenyl)-1,2,3-butanetriol [obtained as described in Step 7(ii) above] in 18 ml of pyridine at 0° C. After stirring the resulting mixture for 0.5 hours, saturated aqueous sodium hydrogen carbonate solution was added to the reaction mixture and the product was extracted with ethyl acetate. The organic layer was washed with dilute hydrochloric acid and then washed with aqueous sodium chloride solution and then concentrated under reduced pressure. The resulting residue was purified by chromatography on a silica gel (100 g) column using a 1:1 mixture of ethyl acetate and hexane as the eluant to afford 5.04g (yield 84%) of the title compound as a colorless oil.

Provenance & Evidence