The reactions of 2-pyridones with benzyne were investigated in order to gain some insight into the structure–reactivity–chemoselectivity relationship involved in the tautomeric systems. All reactions examined have resulted in the formation of Diels-Alder and Michael-type adducts. It has been shown that the Diels-Alder reactivities were well correlated with the HOMO energy levels of the 2-pyridone form and the yields of the Michael-type adduct were closely associated with the tautomeric equilibria. In summary, the chemoselectivities of 2-pyridones in the reaction with benzyne were largely affected by the tautomeric properties.
对2-
吡啶酮与苯炔的反应进行了研究,以获取有关该互变异构体系中结构-反应性-
化学选择性关系的深入见解。所有检查的反应都导致了狄尔斯-阿尔德和迈克尔型加成物的形成。研究表明,狄尔斯-阿尔德的反应性与2-
吡啶酮形式的最高占据分子轨道(HOMO)能级之间有良好的相关性,而迈克尔型加成物的产率与互变平衡密切相关。总之,2-
吡啶酮与苯炔反应中的
化学选择性受到互变特性的很大影响。