Propellanes. 17. Bridgehead olefins via solvolysis of 10,10-dibromo[4.3.1]propellanes
作者:Philip M. Warner、Shih-Lai Lu、Elaine Myers、Patrick W. DeHaven、Robert A. Jacobson
DOI:10.1021/ja00457a034
日期:1977.6
to bicyclo(4.3.1)decane ring systems. Acetolysis of 1 afforded two products one of which a bridgehead olefin rearranged to cyclopropyl acetates. Cyclopropyl acetates arose primarily from a bridgehead olefin. Acetolysis of tertiary mesylate gave bridgehead olefin, which was shown not to rearrange to a second bridgehead olefin. Mechanistic explanations for the formation of these products are given.
本文报道了 10,10-二溴(4.3.1)propellane (1) 和 10,10-dibromo(4.3.1)propell-3-ene (4) 的水解和乙酰化结果。水解(Ag/sup +/ 辅助,丙酮水溶液),前者产生五种产物,而后者仅产生两种产物。显示出氢化薁酸产物是通过双环 (4.3.1) 癸烷核的重排产生的;在延长的反应条件下,一种产物重排为氢化芴。通过衍生的 2,4-DNP 的 X 射线晶体学研究证明了另外两种的立体化学;发现它们都发生跨环环化成双环(4.3.1)癸烷环系统。1 的乙酰化得到两种产物,其中一种桥头烯烃重排为乙酸环丙酯。乙酸环丙酯主要来自桥头烯烃。叔甲磺酸酯的乙酰解产生桥头烯烃,其显示不重排为第二桥头烯烃。给出了这些产物形成的机理解释。