Orbital control of stereochemistry in acid-catalysed addition reactions of endo -tricyclo[3.2.1.02,4]0ct-6-ene
作者:Merle A. Battiste、James M. Coxon、Gregory W. Simpson、Peter J. Steel、Alan J. Jones
DOI:10.1016/s0040-4020(01)82440-6
日期:1984.1
The reaction of endo-tricyclo[3.2.1.02,4]oct-6-ene 1 with methanol in the presence of catalytic amounts of toluene-p-sulphonic acid has been shown to give 2-exo- and endo-methoxybicyclo[3.2.1]oct-3-ene (2c) and (2d) and 2-endo-methoxybicyclo[3.2.1]oct-6-ene (13). The formation of 2-exo- methoxybicyclo[3.2.1]oct-3-ene (2c), the major product of reaction, has been probed by deuterium labelling experiments
已显示在催化量的甲苯-对-磺酸存在下,内三环[3.2.1.0 2,4 ] oct-6-ene 1与甲醇的反应生成了2- exo-和内甲氧基双环[3.2 .1]辛-3-烯(2c)和(2d)和2-内甲氧基双环[3.2.1]辛-6-烯(13)。反应的主要产物2-外-甲氧基双环[3.2.1] oct-3-ene(2c)的形成已通过氘标记实验和一系列6- exo -7- exo -dideuterobicyclo [3.2]进行了探测。.1]合成2的辛-3-烯H,1 H和13 C NMR光谱分析,目的是确定质子攻击内环-三环[3.2.1 0 2,4 ] oct-6-ene(1)的立体化学。已确定2-外-甲氧基双环[3.2.1]辛-3-烯(2c)的形成涉及环丙基部分的角质子化和骨架重排成烯丙基阳离子,具有较小但可测量的记忆效应