Author's Organization：School of Pharmaceutical Sciences, Showa University School of Pharmaceutical Sciences, Showa University School of Pharmaceutical Sciences, Showa University School of Pharmaceutical Sciences, Showa University Faculty of Pharmaceutical Sciences, University of Tokyo
1, 2, 3-Triazine 2-imine reacted with dimethyl acetylenedicarboxylate to give adducts of a novel type (2, 3-bis (carbomethoxy) -8, 8a-dihydropyrazolo[2, 3-b][1, 2, 4]triazines) which were considered to be formed from the primary 1, 3-dipolar cycloadducts via a ring transformation.
