Molecular Orbital Considerations for Kinetically-Controlled Cycloaddition Reactions of Cyclohepta[<i>b</i>]furan-2-ones to 2,3-Bis(methoxycarbonyl)-7-oxabicyclo[2.2.1]heptadiene, Enamines, and Alkoxyethenes
作者:Guan Rong Tian、Shigeru Sugiyama、Akira Mori、Hitoshi Takeshita、Miwako Higashi、Hiroyuki Yamaguchi
DOI:10.1246/cl.1988.941
日期:1988.6.5
2,3-Bis(methoxycarbonyl)-7-oxabicyclo[2.2.1]heptadiene gave the [4+2] cycloadducts with 8,8-dicyanoheptafulvene and cycloheptaf[b]-furan-2-ones. This mode is different from the [8+2] cycloadduct formations with the previously studied enamines and alkoxyethenes. The results from MNDO calculations were in accord to the observed modes of the cycloadditions. Thermolysis of the cycloadducts gave the methylidene derivatives of “homobarrelenes”.
2,3-双(甲氧基碳酸基)-7-氧双环[2.2.1]庚二烯与8,8-二氰基庚烯醇的[4+2]环加成物和环庚芬-2-酮形成了环加成物。这种模式与之前研究的烯胺和烷氧基乙烯的[8+2]环加成物形成不同。MNDO计算的结果与观察到的环加成模式相符。环加成物的热解生成了“同巴伦烯”的甲烯基衍生物。