Hydrochloric Acid → HCID 17989118, compound

Participants

Reaction Conditions

Reaction Steps

1.05 g (3.3 mmol) of ethyl-3-[1-(3-fluoro-2-methoxyphenyl)-cyclohexyl]-2-oxopropionate and 0.74 ml (5 mmol) of (trifluoromethyl)-trimethylsilane in 7 ml of THF are mixed with 62 mg of tetramethylammonium fluoride at −40° C. It is stirred for 2 hours at −25° C., and then another 0.35 ml (2.4 mmol) of (trifluoromethyl)-trimethylsilane and 62 mg of tetramethylammonium fluoride are added. After another 2 hours, 1 ml of 2N hydrochloric acid is added, and the reaction mixture is added to water. It is extracted several times with ethyl acetate, washed with saturated sodium chloride solution, dried with sodium sulfate and concentrated by evaporation in a vacuum. After chromatographic purification on silica gel (hexane/ethyl acetate 10%-40%), 800 mg of ethyl-3-[1-(3-fluoro-2-methoxyphenyl)-cyclopropyl]-2-hydroxy-2-(trifluoromethyl)-propionate is obtained as a yellow oil. This oil is mixed in 40 ml of diethyl ether at 0° C. with 150 g (4 mmol) of lithium aluminum hydride and stirred for 2.5 more hours at room temperature. 20 ml of saturated ammonium chloride solution is carefully added to the batch at 0° C., and it is stirred vigorously for 15 minutes. It is extracted several times with diethyl ether, washed with saturated sodium chloride solution, dried with sodium sulfate, and concentrated by evaporation in a vacuum. After chromatographic purification on silica gel (hexane/ethyl acetate 10%-15%), 630 g of 3-[1-(3-fluoro-2-methoxyphenyl)-cyclopropyl]-2-(trifluoromethyl)-propane-1,2-diol is obtained.

Provenance & Evidence