Hydrochloric Acid → (1R,2R)-2-(4-Chloro-phenoxymethyl)-4-methanesulfonyloxy-cyclopentanecarboxylic acid ethyl ester

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Reaction Steps

To a cold (ice bath) solution of (1R,2R)-2-(4-Chloro-phenoxymethyl)-4-hydroxy-cyclopentanecarboxylic acid ethyl ester (epimeric mixture, 312 mg) and triethylamine (528 mg) in dichloromethane (6 mL) was added methanesulfonyl chloride (580 mg). The reaction mixture was stirred 36 h at room temperature then hydrochloric acid (1N) was added. The reaction mixture was extracted with dichloromethane. The combined organic layers were washed with an aqueous half-saturated solution of sodium carbonate and half saturated brine then dried over sodium sulfate and concentrated in vacuo. The residue was purified by flash chromatography on silica gel with a gradient of cyclohexane/ethylacetate (3:1 to 3:1 v/v) as eluant to afford the title compound (0.380 g, 97%) as a light yellow oil. MS (EI): 377.1 (M+H)+.

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