Methanol → 4-(1-(4-Methoxy-2,6-dimethylphenylsulfonyl)piperidin-2-yl)butanoic Acid

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Reaction Steps

Methyl 4-(1-(4-methoxy-2,6-dimethylphenylsulfonyl)piperidin-2-yl)butanoic acid methyl ester (1.65 g, 4.3 mmol) was dissolved in water (10 ml) and methanol (35 ml) and lithium hydroxide (0.3 g, 12.9 mmol) was added. The mixture was stirred for 3 d at room temperature, then methanol was distilled off under vacuum and ethyl acetate (50 ml) and HCl solution (1 mol/l, 10 ml) added to the residue. Phase separation, extraction with ethyl acetate (2×50 ml), the combined organic phases were dried over sodium sulfate and concentrated to small volume under vacuum. Yield: 1.56 g (98%)

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