Practical, Modular, and General Synthesis of Benzofurans through Extended Pummerer Annulation/Cross-Coupling Strategy
作者:Kei Murakami、Hideki Yorimitsu、Atsuhiro Osuka
DOI:10.1002/anie.201403288
日期:2014.7.14
Operationally simple, efficient, and widely applicable Pummerer annulations of simple phenols with ketene dithioacetal monoxides, with the aid of trifluoroacetic anhydride, have been shown to provide a variety of benzofurans having a methylthio group at the 2‐position. Subsequent and newly developed nickel‐catalyzed arylation at the methylthio group culminates in diversity‐oriented synthesis of multisubstituted
已证明在三氟乙酸酐的帮助下,简单酚的操作简单,有效且广泛适用的Pummerer环化与乙烯酮二硫缩醛一氧化碳可提供多种在2位具有甲硫基的苯并呋喃。随后和新开发的甲硫基镍催化的芳基化反应最终导致了多取代苯并呋喃的多样性导向合成。我们扩展的Pummerer环空/交叉耦合序列功能强大,足以合成具有生物活性的天然产物以及高荧光性的苯并呋喃衍生物。