1-Benzyl-4-(4-but-2-ynyloxy-benzenesulfonyl)-piperidine-4-carboxylic acid ethyl ester → 1-Benzyl-4-(4-but-2-ynyloxy-benzenesulfonyl)-piperdine-4-carboxylic acid

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Reaction Steps

1-Benzyl-4-(4-but-2-ynyloxy-benzenesulfonyl)-piperdine-4-carboxylic acid was prepared starting from 1-benzyl-4-(4-but-2-ynyloxy-benzenesulfonyl)-piperdine-4-carboxylic acid ethyl ester (3 g, 6.6 mmol) dissolved in THF:methanol (3:1 150 ml) and 10 N NaOH (15 ml). The resulting reaction mixture was worked up as outlined in Example 1 (Step 7). Yield 1.65 g (59%); off white powder; mp 191° C.; MS: 428 (M+H)+.

Provenance & Evidence