1-Butyl4-[4-(3-methyl-butoxy)-benzenesulfonyl]-piperidine-4-carboxylic acid ethyl ester → 1-Butyl-4-[4-(3-methyl-butoxy)-benzenesulfonyl]-piperidine-4-carboxylic acid

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1-Butyl-4-[4-(3-methyl-butoxy)-benzenesulfonyl]-piperidine-4-carboxylic acid was prepared starting from 1-Butyl-4-[4(3-methyl-butoxy)-benzenesulfonyl]-piperidine4-carboxylic ethyl ester (4.4 g, 10 mmol) dissolved in TBF:methanol (3:1 150 ml) and IO N NaOH (20 ml). The resulting reaction mixture was worked up as outlined in example 83. Yield 3.2 g (77%); white solid; mp 188° C.; MS: 412 (M+H)+

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