Synthesis of Pyrrole via Formal Cycloaddition of Allyl Ketone and Amine under Metal-Free Conditions
作者:Jinli Wang、Meizhong Tang、Weijin Gu、Shenlin Huang、Lan-Gui Xie
DOI:10.1021/acs.joc.2c01565
日期:2022.9.16
A new metal-free synthesis of pyrrole from allyl ketone and amine has been established. The reaction proceeds via an thiolative activation of the C–C double bond with dimethyl(methylthio)sulfonium trifluoromethanesulfonate, followed by a nucleophilic ring-opening addition of primary amine to the generated episulfonium intermediate, and then an internal condensation and aromatization. This mild procedure
建立了一种由烯丙基酮和胺无金属合成吡咯的新方法。该反应通过用二甲基(甲硫基)锍三氟甲磺酸盐对 C-C 双键进行硫醇化活化,然后将伯胺与生成的环鎓中间体进行亲核开环加成,然后进行内部缩合和芳构化。这种温和的过程为通过正式的 [4 + 1] 环加成反应构建取代的吡咯提供了一种新的策略。