Process for the preparation of a dialkyl trans-piperidine-2,5-dicarboxylate from a corresponding dialkyl cis-piperidine-2,5-dicarboxylate via a trans-substituted pyridine derivative of the formula ##STR1## wherein R is a (C.sub.1 -C.sub.3)alkyl group.
从相应的二烷基顺式-
哌啶-2,5-二
羧酸二烷酯经由一种公式为##STR1##的顺式取代
吡啶衍生物制备二烷基反式-
哌啶-2,5-二
羧酸二烷酯的方法,其中R为(C.sub.1-C.sub.3)烷基。