Efficient Co(OAc)2-catalyzed aerobic oxidation of EWG-substituted 4-cresols to access 4-hydroxybenzaldehydes
作者:Jian-An Jiang、Jia-Lei Du、Dao-Hua Liao、Zhan-Guo Wang、Ya-Fei Ji
DOI:10.1016/j.tetlet.2013.12.077
日期:2014.2
Co(OAc)2·4H2O/NaOH/O2/ethylene glycol reaction system that enables selective aerobic oxidation of a wide range of substrates covering 2,6-di-EWG-, 2,3,6-tri-EWG-, 2-EWG-, and 2-EWG-6-EDG-substituted 4-cresols into the corresponding 4-hydroxybenzaldehydes. Based on the experimental investigations and well-defined p-benzoquinone methides, a plausible reaction mechanism was proposed. Considering the simplicity of
我们报告了一种高效的无配体Co(OAc)2 ·4H 2 O / NaOH / O 2 /乙二醇反应系统,该系统能够对包括2,6-di-EWG-,2,3在内的多种底物进行选择性好氧氧化,6-tri-EWG-,2-EWG-和2-EWG-6-EDG取代的4-甲酚变成相应的4-羟基苯甲醛。基于实验研究和明确定义的对苯醌甲基化物,提出了合理的反应机理。考虑到程序的简便性和产品的重要性,该方法有望成为相关的苄基C(sp 3)–H官能化化学中的一种有利且实用的工具。