Oxidopyridinium ions bearing an ester group at the 5-position undergo (4 + 3) cycloaddition reaction to afford congeners of 7-azabicyclo[4.3.1]decane. The reaction generally proceeds in high yield, although an excess of diene is often required to achieve such yields. The reaction is highly regioselective, but not endo/exo selective. It appears the cycloaddition process can be either kinetically or
在5位带有酯基的氧
吡啶吡啶鎓离子经历(4 + 3)环加成反应,得到7-
氮杂双环[4.3.1]
癸烷的同类物。反应通常以高收率进行,尽管通常需要过量的二烯以达到这样的收率。该反应是高度区域选择性的,但不是内/外选择性的。看起来环加成过程可以动力学或热力学控制,这取决于所用二烯的性质和反应时间。分子内Heck反应用于证明环加合物可能存在某些
化学反应。