Water → Biphenyl-2-ylcarbamic acid 1-[2-(4-hydroxymethyl-2,5-dimethylphenylcarbamoyl)ethyl]piperidin-4-yl ester

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Reaction Steps

To a solution of 4-{3-[4-(biphenyl-2-ylcarbamoyloxy)piperidin-1-yl]propionylamino}-2,5-dimethylbenzoic acid methyl ester (49.8 g, 93.9 mmol) in tetrahydrofuran (200 mL) was cooled to 0° C. and lithium aluminum hydride (10.7 g, 281.7 mmol) added portion-wise (10×1.07 g). The resulting mixture was stirred for 3 hours and then water (10.7 mL) was added, followed by 1N aqueous sodium hydroxide (10.7 mL) and additional water (32.1 mL). This mixture was stirred overnight and then filtered. The organic layer was concentrated under vacuum and the residue was mixed with ethyl acetate (about 5:1 v/w ethyl acetate to residue). This mixture was heated until all the solid material dissolved and then the solution was allowed to cool to room temperature. The resulting precipitate was filtered and dried to afford biphenyl-2-ylcarbamic acid 1-[2-(4-hydroxymethyl-2,5-dimethylphenylcarbamoyl)ethyl]piperidin-4-yl ester (24.6 g, 95% purity, 47.5% yield). This material was used without further purification. m/z: [M+H+] calcd for C30H35N3O4 502.62; found 502.5.

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