| 摘要 |
PCT No. PCT/US92/00029 Sec. 371 Date Aug. 20, 1993 Sec. 102(e) Date Aug. 20, 1993 PCT Filed Jan. 8, 1992 PCT Pub. No. WO92/15561 PCT Pub. Date Sep. 17, 1992.Process for the preparation of a dialkyl trans-piperidine-2,5-dicarboxylate from a corresponding dialkyl cis-piperidine-2,5-dicarboxylate via a transsubstituted pyridine derivative of the formula <IMAGE> (I) wherein R is a (C1-C3)alkyl group.
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