Lithium Hydroxide → 3-Cyclopentyl-2-[4-(3-methoxy-prop-1-ynyl)-phenyl]-propionic acid

Participants

Reaction Conditions

Reaction Steps

A solution of 3-cyclopentyl-2-[4-(3-methoxy-prop-1-ynyl)-phenyl]-propionic acid methyl ester (485 mg, 1.61 mmol) in tetrahydrofuran (10 mL) and water (10 mL) was treated with lithium hydroxide (775 mg, 18.5 mmol). The reaction mixture was stirred at 25° C. for 48 h. At this time, the reaction was concentrated in vacuo. The residue was re-dissolved in water (40 mL) which was then acidified to pH=2 with concentrated hydrochloric acid. This solution was extracted with ethyl acetate (2×40 mL). The aqueous layers were back extracted with ethyl acetate (1×40 mL). The combined organic extracts were then washed with a half-saturated aqueous sodium chloride solution (1×40 mL), dried over sodium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2-[4-(3-methoxy-prop-1-ynyl)-phenyl]-propionic acid (447 mg, 96.7%) as a white solid: mp 82-85° C.; EI-HRMS m/e calcd for C18H22O3 (M+) 286.1568, found 286.1563.

Provenance & Evidence