Benzenemethanamine, N,N-bis(2-chloroethyl)-4-fluoro- → 4-(4-But-2-ynyloxy-benzenesulfonyl)-1-(4-fluoro-benzyl)-piperidine-4-carboxylic acid ethyl ester

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4-(4-But-2-ynyloxy-benzenesulfonyl)-1-(4-fluoro-benzyl)-piperidine-4-carboxylic acid ethyl ester was prepared according to the general method as outlined in Example 1 (Step 6). Starting from (4-but-2-ynyloxy-benzenesulfonyl)-acetic acid ethyl ester (5 g, 16.9 mmol) and (4-fluoro-benzyl)-bis-(2-chloro-ethyl)-amine (5.8 g, 20.1 mmol) 5.3 g of the product was isolated. Yield 5.3 g (67%); Brown oil; MS: 474 (M+H)+

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