One-Pot Allylation–Intramolecular Vinylogous Michael Addition–Isomerization Cascade of <i>o</i>-Hydroxycinnamates and Congeners: Synthesis of Substituted Benzofuran Derivatives
作者:Battu Harish、Manyam Subbireddy、Owk Obulesu、Surisetti Suresh
DOI:10.1021/acs.orglett.9b00414
日期:2019.3.15
intramolecular vinylogous Michael addition leading to the synthesis of heterocycles has been disclosed. Base-promoted one-pot sequential O-allylation of o-hydroxy-cinnamates or -cinnamonitrile or -chalcones with γ-bromocrotonates followed by an intramolecular conjugate addition of vinylogous Michael donors resulted in the formation of highly substituted benzofuran derivatives in good to excellent yields. The intramolecular
已经公开了导致杂环的合成的独特的分子内乙烯基乙烯基迈克尔加成。碱促进的邻位羟基肉桂酸酯或-肉桂腈或-邻苯二甲酸酯与γ-溴丁酸的一锅顺序O-烯丙基化反应,然后在分子内共轭添加乙烯基Michael供体导致高取代度的高取代苯并呋喃衍生物形成。分子内事件继之以两个[1,3] -H转变导致芳构化,似乎是这种前所未有的转化成功的关键。