Water → 3-[(1-Acetyl-piperidin-4-yl)-(4-methyl-cyclohexanecarbonyl)-amino]-5-phenyl-thiophene-2-carboxylic acid

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Reaction Steps

3-[(1-Acetyl-piperidin-4-yl)-(4-methyl-cyclohexanecarbonyl)-amino]-5-phenyl-thiophene-2-carboxylic acid methyl ester (50 mg, 0.104 mmol) was dissolved in a 4:1 mixture of dioxane:H2O (1 ml) and then LiOH 1N (310 ul, 0.310 mmol) was added. After 5 hours of stirring at room temperature and 4 hours at reflux, solvents were removed and then partitioned between 5 ml of H2O acidified to pH 4 and 5 ml of EtOAc. The organic layer was separated and the aqueous phase was washed twice with ethyl acetate (2×5 mL). The combined ethyl acetate layer was dried (Na2SO4) and concentrated. The residue was purified by preparative chromatography (100/90/16/1 CH2Cl2/CHCl3/MeOH/Et3N) to obtain 27 mg (56%) of 3-[(1-Acetyl-piperidin-4-yl)-(4-methyl-cyclohexanecarbonyl)-amino]-5-phenyl-thiophene-2-carboxylic acid (Compound 48).

Provenance & Evidence