Molecular Orbital Considerations for Kinetically-Controlled Cycloaddition Reactions of Cyclohepta[b]furan-2-ones to 2,3-Bis(methoxycarbonyl)-7-oxabicyclo[2.2.1]heptadiene, Enamines, and Alkoxyethenes
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”.