作者:Fengtian Wu、Rongxian Bai、Yanlong Gu
DOI:10.1002/adsc.201600048
日期:2016.7.14
Benzofuran derivatives can be synthesized through the sequential Michael addition and cyclization of 1,3‐dicarbonyl compounds with 1,4‐benzoquinones. However, ketones are rarely used in this reaction because of their low nucleophilicities. In this study, this problem was solved by utilizing triethyl orthoformate, which enabled the formation of a vinyl ethyl ether as an additive. As a result, the nucleophilicity
苯并呋喃衍生物可以通过依次进行迈克尔加成反应和将1,3-二羰基化合物与1,4-苯醌合成的方法合成。但是,由于其亲核性低,因此在该反应中很少使用酮。在这项研究中,通过使用原甲酸三乙酯解决了这个问题,这使得能够形成乙烯基乙基醚作为添加剂。结果,酮的亲核性增加。通过这些新近建立的反应,还制备了许多重要的5-羟基苯并呋喃衍生物,这些衍生物过去很难通过合成获得。