Towards ortho-selective electrophilic substitution/addition to phenolates in anhydrous solvents
作者:Eleana Lopušanskaja、Anni Kooli、Anne Paju、Ivar Järving、Margus Lopp
DOI:10.1016/j.tet.2021.131935
日期:2021.3
solution lead to a mixture of o- and p-Bn-substituted phenols together with a substantial amount of phenol Bn ether. In CPME, and especially in toluene with 1–2 equivalents of ether or alcohol additives, ortho-selective alkylation is achieved. In the case of o,o,p-tri- and o,o-di-substituted phenols dearomatization occurs affording o-Bn-substituted alkyl cyclohexadienones with yields up to 92% with an o/p
在水溶液中用BnBr进行烷基取代的Li-苯酚盐会生成邻和对Bn-取代的苯酚与大量的苯酚Bn醚的混合物。在CPME中,尤其是在具有1-2当量的醚或醇类添加剂的甲苯中,可以实现邻位选择性烷基化。在的情况下O,O-,P-三-和ö,ø -二-取代的苯酚脱芳构化,得到发生ø -Bn取代的烷基环己二烯酮与产率高达92%,其具有ø / p比高达90/1。