Methanol → [[3-(2-amino-1,2-dioxoethyl)1-[(2,6-dichlorophenyl)methyl]-2-methyl-1H-indol-4-yl]oxy]acetic acid

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Reaction Steps

A mixture of 420 mg (0.94 mmol) of [[3-(2-amino-1,2-dioxoethyl)-1-[(2,6-dichlorophenyl)methyl]-2-methyl-1H-indol-4-yl]oxy]acetic acid methyl ester, 5 mL of 1N NaOH and 15 mL of MeOH was heated to maintain reflux for 0.17 hours, cooled to room temperature and stirred 0.5 hours. Ethyl acetate and water was added, the aqueous layer separated, made acidic to pH 2-3 with 1N HCl, and the mixture extracted with ethyl acetate two times. The part that was not soluble was filtered. The filtrate was dried (MgSO4) and concentrated. The remaining solid was washed with a small volume of ether/methylene chloride and the insoluble material filtered and combined with the filtered material above to give 351 mg (86% yield) of [[3-(2-amino-1,2-dioxoethyl)1-[(2,6-dichlorophenyl)methyl]-2-methyl-1H-indol-4-yl]oxy]acetic acid, mp, 236-239° C.

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