Sequential Diels-Alder Reactions on a 1,3,7,9-Tetraene: An Efficient and Stereoselective Route to the Perhydrophenanthrene Skeleton
作者:Claude Spino、Jason Crawford、John Bishop
DOI:10.1021/jo00109a014
日期:1995.2
A novel, efficient, and stereoselective route to the perhydrophenanthrene skeleton is described utilizing sequential Diels-Alder reactions of methyl (trimethylsilyl)ethynyl}aclylate with a 1,3,7,9-tetraene (bis-diene).
Spino, Claude; Crawford, Jason, Canadian Journal of Chemistry, 1993, vol. 71, # 7, p. 1094 - 1098
作者:Spino, Claude、Crawford, Jason
DOI:——
日期:——
The dimerisation of 2-methoxycarbonylbuta-1,3-diene: the importance of paralocalisation energy in assessing diene reactivity
The dimerisation and competitive cycloaddition of 2-methoxycarbonylbuta-1,3-diene with electron-rich dienes has been investigated. Experimental results provide evidence that the enthalpy of the π-system significantly influences the energy of the transition state of cycloadditions of this type. This has been corroborated by ab initio calculations. We propose an early reorganisation of the π-electrons in such cycloadditions to explain the influence stated above.