Friedel-Crafts acylation of 2-trimethylsilylnorbornene. Effect of acyl group on the position of attack
作者:Gopalpur Nagendrappa、Noor Shahina Begum
DOI:10.1016/s0040-4020(99)00402-0
日期:1999.6
The acylation of 2-trimethylsilylnorbornene 1 in the presence of aluminium chloride gives minor quantities of the expected 2-norbornenyl ketones 4. The formation of 3 and 5 as major products indicates that either α-or β-attack takes place predominantly depending on the nature of the acyl group, and the β-silicon effect is not a decisive factor. The β-silyl cation intermediate 2 mainly leads to nortricyclyl
2-三甲基甲硅烷基降冰片烯1在氯化铝存在下的酰化作用可得到少量的预期2-降冰片烯基酮4。作为主要产物的3和5的形成表明,主要取决于酰基的性质而发生α攻击或β攻击,而β硅效应不是决定性因素。β-甲硅烷基阳离子中间体2主要通过1,3-去质子化产生正三环基酮3,并且α-甲硅烷基阳离子8经历重排以产生新颖的桥头甲硅烷基化产物5。