Synthesis of 4-(ω-X-alkyl)benzonitriles (X = 1,3-dioxan-2-yl, CN, CO2Et) by the reaction of terephthalonitrile dianion with ω-X-alkyl bromides in liquid ammonia
作者:R. Yu. Peshkov、Chynyan Wang、E. V. Panteleeva、E. V. Tretyakov、V. D. Shteingarts
DOI:10.1007/s11172-016-1602-x
日期:2016.10
The main products of the reaction of terephthalonitrile dianion disodium salt with ω-X-alkyl bromides (2-(2-bromoethyl)-1,3-dioxane, 5-bromovaleronitrile, ethyl 6-bromohexanoate) in liquid ammonia are the corresponding 4-(ω-X-alkyl)benzonitriles. Similar reactions of benzonitrile radical anion sodium salt lead to ω-X-alkylbenzenes. In both cases the formation of products is due to selective ipso-alkylation
对苯二甲腈双阴离子二钠盐与ω-X-烷基溴化物(2-(2-溴乙基)-1,3-二恶烷、5-溴戊腈、6-溴己酸乙酯)在液氨中反应的主要产物为相应的4- (ω-X-烷基)苄腈。苄腈自由基阴离子钠盐的类似反应导致ω-X-烷基苯。在这两种情况下,产物的形成都是由于阴离子形式的选择性同位烷基化,这表明在这些反应中对苯二甲腈二阴离子和苄腈自由基阴离子的亲核活性以及通过 SN2 机制实现烷基化。