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The synthesis of proline analogues bearing a fluorine-containing substituent at the fifth position of the pyrrolidine ring, racemic trans- and cis-5-fluoromethyl prolines, was performed. The key step of the synthesis is a transformation of the CH 2 OH-group into the CH 2 F-one using morpholinosulfur trifluoride. During the synthesis, an efficient procedure to prepare trans- and cis-5-fluoropipecolic...
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