Abstract
In the previous paper, it was reported that the structure of the adduct (II), which was produced from the Diets-Alder reaction of 1-methyl-2-(1H) pyridone (I) with maleic anhydride, was estimated to be 2-methyl-3-oxo-2-azabicyclo [2.2.2] oct-7-ene-5, 6-endo-dicarboxylic anhydride. It was also mentioned that the structure of the diester com-pound (IV), which was obtained by the epimerization, was estimated to be dimethyl 2-methyl-3-oxo-2-azabicyclo [2.2.2] oct-7-ene-5-endo-6-exo-dicarboxylate.
In this work, the same reactions were carried out on 3, 5-dideutero-1-methyl-2 (1H)-pyridone (ID). The structures of II and IV were unambiguously confirmed to the same as those in the previous paper.
