Trifluoroacetic acid → [(3S,4R)-4-(4-Chloro-phenyl)-1-(piperidine-4-carbonyl)-pyrrolidin-3-yl]-ethyl-carbamic acid 4-fluoro-phenyl ester

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In analogy to the procedure described for the synthesis of [(3R,4S)-4-(4-Chloro-phenyl)-1-(piperidine-4-carbonyl)-pyrrolidin-3-yl]-ethyl-carbamic acid 4-fluoro-phenyl ester the title compound was prepared from 4-{(3R,4S)-3-(4-Chloro-phenyl)-4-[ethyl-(4-fluoro-phenoxycarbonyl)-amino]-pyrrolidine-1-carbonyl}-piperidine-1-carboxylic acid tert-butyl ester through cleavage of the protecting group with TFA. The title compound was obtained as yellow foam. MS m/e: 474.3 [M+H]+.

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