C([NH:4][C:5]1[CH:13]=[CH:12][C:11]([CH:14]([CH3:16])[CH3:15])=[CH:10][C:6]=1[C:7]([OH:9])=[O:8])(=O)C.O.[OH-].[Li+].Cl>C1COCC1.O>[NH2:4][C:5]1[CH:13]=[CH:12][C:11]([CH:14]([CH3:16])[CH3:15])=[CH:10][C:6]=1[C:7]([OH:9])=[O:8]A mixture of Example 2B (0.621 g, 2.81 mmol) and lithium hydroxide monohydrate (0.38 g, 9.0 mmol) in THF (6 mL) and water (6 mL) was stirred at 60° C. for 72 hours, acidified to pH 3.5 with 1M HCl, and extracted twice with ethyl acetate. The combined extracts were dried (MgSO4), filtered, and concentrated. The concentrate was purified by C18 reverse-phase HPLC with acetonitrile/water/0.1% TFA to provide the desired product. MS (ESI(+)) m/e 180 (M+H)+; (ESI(−)) m/e 178 (M−H)−.
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