Rapid Access to Amino-Substituted Quinoline, (Di)Benzofuran, and Carbazole Heterocycles through an Aminobenzannulation Reaction
作者:Martin Tiano、Philippe Belmont
DOI:10.1021/jo800249f
日期:2008.6.1
quinolines, dibenzofurans, and carbazoles. The precursors are heterocycles bearing a methyl ketone group ortho to an internal alkyne. They are commercially available or can be obtained in three to four classical and efficient reactions: Vilsmeier−Haack, Sonogashira (diversity point), Grignard, and Ley’s oxidation. Upon aminobenzannulation reaction—classical conditions being pyrrolidine neat or in a solvent
强大的氨基苯甲酸酯化反应已用于合成氨基取代的喹啉,二苯并呋喃和咔唑。前体是带有与内部炔烃邻位的甲基酮基的杂环。它们可以商购获得,也可以通过三到四个经典有效的反应获得:Vilsmeier-Haack,Sonogashira(多样性点),Grignard和Ley's氧化反应。在进行氨基苯甲酸酯化反应时(典型的条件是纯净的吡咯烷或在溶剂中和4ÅMS的条件下),在某些情况下,随着烯胺的形成,会得到有趣的双取代喹啉,二苯并呋喃和咔唑。由于meta产生了取代的杂环,并且还不同于经典的杂环方法,经典的杂环方法是在含杂原子的环上进行封闭而不是形成苯环。