Tautomerism of Aza heterocycles: V. Structure of the spontaneous transformation products of 5-methyl-2-phenyl-3,3a,4,5,6,7-hexahydro-2H-pyrazolo-[4,3-c]pyridin-3-one in crystal and solution
作者:A. T. Gubaidullin、V. N. Nabiullin、S. V. Kharlamov、B. I. Buzykin
DOI:10.1134/s1070363214060188
日期:2014.6
to the formation of a complex mixture of products. Among these products, we isolated and identified 3a,3a′-methylenebis(5-methyl-2-phenyl-3,3a,4,5,6,7-hexahydro-2H-pyrazolo[4,3-c]pyridin-3-one), 1-methyl-3-(2-phenylhydrazinylidene)pyrrolidin-2-one, and 5-methyl-2-phenyl-3,5,6,7-tetrahydro-2H-pyrazolo[4,3-c]pyridine. The structure of methyl 3-(2-phenylhydrazinylidene)-4,5-dihydro-3H-pyrrole-2-carboxylate
5-甲基-2-苯基-3,3a,4,5,6,7-六氢-2 H-吡唑并[4,3 - c ]吡啶-3-一以两性离子的形式存在,质子位于氮原子上哌啶环和负电荷在吡唑酸酯片段上离域。该化合物在晶体中稳定,但在溶液中可用。其色谱纯化和尝试通过在乙醇或苯中加热使苯肼与1-甲基-4-氧代哌啶-3-羧酸烷基酯缩合重结晶或合成,从而形成复杂的产物混合物。在这些产品中,我们分离并鉴定了3a,3a'-亚甲基双(5-甲基-2-苯基-3,3a,4,5,6,7-六氢-2 H-吡唑并[4,3- c] pyridin-3-one),1-甲基-3-(2-phenylhydrazinylidene)pyrrolidin-2-one和5-methyl-2-phenyl-3,5,6,7-tetrahydro-2 H -pyrazolo [4 ,3- c ]吡啶。3-(2-苯基肼基亚甲基)-4,5-二氢-3 H-吡咯-2-羧酸酯和3a,5-二甲基-2-苯基-3