4-(4-But-2-ynyloxy-benzenesulfonyl)-1-(4-chloro-benzyl)-piperdine-4-carboxylic acid ethyl ester → 4-(4-But-2-ynyloxy-benzenesulfonyl)1-(4-chloro-benzyl)-piperdine-4-carboxylic acid

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Reaction Steps

4-(4-But-2-ynyloxy-benzenesulfonyl)-1-(4-chloro-benzyl)-piperdine-4-carboxylic acid was prepared starting from 4-(4-but-2-ynyloxy-benzenesulfonyl)-1-(4-chloro-benzyl)-piperdine-4-carboxylic acid ethyl ester (3.14 g, 6.42 mmol) dissolved in THF:methanol 3:1 (100 ml) and 10 N NaOH (10 ml). The resulting reaction mixture was worked up as outlined in Example 1 (Step 7). Yield 2.37 g (80%); white solid; mp 205° C.; MS: 461.9 (M+H)+.

Provenance & Evidence