4-(4-But-2-ynyloxy-benzenesulfonyl)-1-(4-fluoro-benzyl)-piperidine-4-carboxylic acid ethyl ester → 4-(4-But-2-ynyloxy-benzenesulfonyl)-1-(4-fluoro-benzyl)-piperidine-4-carboxylic acid

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Reaction Steps

4-(4-But-2-ynyloxy-benzenesulfonyl)-1-(4-fluoro-benzyl)-piperidine-4-carboxylic acid was prepared starting from 4-(4-but-2-ynyloxy-benzenesulfonyl)-1-(4-fluoro-benzyl)-piperidine-4-carboxylic acid ethyl ester (9.5 g, 20 mmol) dissolved in THF:methanol 3:1 (100 ml) and 10 N NaOH (20 ml). The resulting reaction mixture was worked up as outlined in Example 1 (Step 7). Yield 5.7 g (63%); white solid; mp 106-106° C.; MS: 447 (M+H)+.

Provenance & Evidence