Hydrochloric Acid → (2R)-2-[3-cyclopropyl-4-(cyclopropylsulfonyl)phenyl]-3-[(1R)-3-oxocyclopentyl]propanoic acid

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Reaction Steps

A mixture of (2R)-2-[3-cyclopropyl-4-(cyclopropylsulfonyl)phenyl]-3-[(2R)-8,8-dimethyl-6,10-dioxaspiro[4.5]dec-2-yl]propionic acid (22 g), 4 M hydrochloric acid (22 mL), and acetone (88 mL) was stirred under heating and reflux for 2 hours. The solvent was evaporated under reduced pressure, and then to the residue were added ethyl acetate/water (1/3, 300 mL) and sodium hydroxide (5.7 g) under ice-cooling. To the aqueous layer was added concentrated hydrochloric acid under ice-cooling to adjust the pH to 1, and chloroform was added thereto. The organic layer was washed with saturated brine and dried over anhydrous sodium sulfate, and the solvent was then evaporated under reduced pressure to obtain (2R)-2-[3-cyclopropyl-4-(cyclopropylsulfonyl)phenyl]-3-[(1R)-3-oxocyclopentyl]propionic acid (17.9 g) as a colorless amorphous substance.

Provenance & Evidence