Sodium Hydroxide → 3,4-dihydro-4-oxo-8-propyl-7[2-[(5,6,7,8-tetrahydro-1-naphthalenyl)oxy]ethoxy]-2H-1-benzopyran-2,2-dipropanoic acid

Participants

Reaction Steps

A mixture of 150 mg (0.277 mmol) of the titled product of Example 60, 3 ml of methanol, and 3 ml of 1N sodium hydroxide was stirred at reflux for one hour. The reaction mixture was permitted to cool and then partitioned between ethyl acetate and 3N hydrochloric acid. The aqueous layer was further extracted with two portions of ethyl acetate. The combined organic extracts were washed with brine, dried (MgSO4), filtered, and the solvent removed under reduced pressure. Crystallization of the residue from ethyl acetate gave 24 mg of the title compound as a solid, m.p. 159.5°-161.5° C.

Provenance & Evidence