Pyridine → Carbonic acid 1-chloroethyl ester (1S,2S)-2-fluorocyclohexyl ester

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Reaction Steps

To a mixture of 1-chloroethyl chloroformate (1.0 mL), pyridine (1.0 mL), and dichloromethane (30 mL), (1S,2S)-2-fluorocyclohexanol [CSA No. 292150-03-9] (900 mg) dissolved in dichloromethane (10 mL) was added at −78° C. After stirring the resulting mixture overnight at room temperature, dichloromethane (30 mL) was added to the mixture. The resulting mixture was sequentially washed with 0.5 N hydrochloric acid and saturated aqueous sodium chloride solution, and dried over anhydrous magnesium sulfate. The resulting mixture was filtered, and the filtrate obtained was concentrated under reduced pressure. The residue obtained was purified by silica gel column chromatography (mixed solvent of heptane-ethyl acetate) to obtain the captioned compound (480 mg).

Provenance & Evidence