1-Butyl-4-[4-(4-chloro-phenoxy)-benzenesulfonyl]-piperidine-4-carboxylic acid ethyl ester → 1-Butyl-4-[4-(4-chloro-phenoxy)-benzenesulfonyl]-piperidine-4-carboxylic acid

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1-Butyl-4-[4-(4-chloro-phenoxy)-benzenesulfonyl]-piperidine-4-carboxylic acid was prepared starting from 1-butyl-4-[4-(4-choro-phenoxy)-benzenesulfonyl]-piperidine-4-carboxylic acid ethyl ester (3.3 g, 6.9 mmol) dissolved in THF:methanol (3:1 150 ml) and 10 N NaOH (25 ml). The resulting reaction mixture was worked up as outlined in example 83. Yield 2.08 g (67%); white solid; mp 201° C.; MS: 451.9 (M+H)+

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