Chemical Reactivity of Dihydropyrazine Derivatives. Cycloaddition Behavior toward Ketenes
作者:Kazuhide Nakahara、Koki Yamaguchi、Yasuyuki Yoshitake、Tadatoshi Yamaguchi、Kazunobu Harano
DOI:10.1248/cpb.57.846
日期:——
The cycloaddition behavior of dihydropyrazines toward ketenes was investigated using single-crystal X-ray structures of the cycloadducts and density functional theory (DFT) calculation data. The reaction proceeds via a stepwise pathway involving an orientation complex prior to formation of the betaine intermediate. This is followed by electrocyclization to afford the 1 : 1 and 1 : 2 adducts bearing
使用环加合物的单晶X射线结构和密度泛函理论(DFT)计算数据研究了二氢吡嗪对乙烯酮的环加成行为。反应在甜菜碱中间体形成之前通过涉及取向复合物的逐步途径进行。然后进行电环化,得到带有β-内酰胺环的1∶1和1∶2加合物。