Efficient preparation method of 4-hydroxybenzoic esters – Oxidation of substituted Hagemman’s ester
作者:Sein Kang、Dahye Kim、Ik Joon In、Sangho Koo
DOI:10.1016/j.tetlet.2017.04.090
日期:2017.6
A practical two-step synthetic method of diversely R-substituted 4-hydroxybenzoic esters, which may have wide applications in household chemicals and polymeric materials, was developed by 2:1 coupling between ethyl acetoacetate and aldehydes (RCHO) in t-BuOK/t-BuOH, followed by oxidative aromatization of the resulting Hagemman’s esters. Application of the condition using stoichiometric NBS and catalytic
通过在t -BuOK / t中将乙酰乙酸乙酯和醛(RCHO)之间以2:1偶联的方法,开发了一种实用的两步合成方法,该方法可以在家用化学品和聚合物材料中广泛应用,是多种R取代的4-羟基苯甲酸酯的合成。-BuOH,然后将所得的哈格曼酯进行氧化芳构化。在化学计量NBS和催化TMS·OTf条件下的应用有效地诱导了Hagemman酯的氧化,生成了4-羟基苯甲酸酯。