Hydrochloric Acid → 4-[3-(6-Cyano-3-oxo-2,3-dihydro-4H-1,4-benzoxazin-4-yl)propyl]-1-[(2E)-3-(2,5-difluorophenyl)prop-2-en-1-yl]piperidine-3-carboxylic acid

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A solution of methyl 1-[(2E)-3-(2,5-difluorophenyl)prop-2-en-1-yl]-4H-[3-(6-cyano-3-oxo-2,3-dihydro-4H-1,4-benzoxazin-4-yl)propyl]piperidine-3-carboxylate (Example 64) (73 mg, 0.143 mmol) in methanol (12 mL) and water (5 mL) was treated with sodium hydroxide solution (1N, 1 mL). After 64 hours, the pH was adjusted to 6 with 1N HCl. The mixture was extracted with ethyl acetate (3×30 mL). The combined organic extracts were dried over magnesium sulfate and concentrated at reduced pressure. Chromatography on silica gel using methanol in dichloromethane (0-10%) and trituration with diethyl ether gave the title compound as a colorless solid, mixture of diastereomers, 10 mg (14%).

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