To a solution of 88 (0.120 g; 0.31 mmol) in methanol (2 mL) was added aqueous sodium hydroxide (1 mL; 2 mmol; 2N). Acetonitrile (2 mL) was added to aid in solubility, and the resulting mixture was stirred overnight. The reaction mixture was acidified with aqueous hydrochloric acid (2N) and extracted with ethyl acetate. The organic layer was dried over sodium sulfate, decanted, and concentrated under reduced pressure. Trituration of the crude product from hexanes and dichloromethane yielded the desired product as a pink solid (121 mg).
