Direct Access to Bridged Tetrahydroquinolines and Chromanes via an InCl<sub>3</sub>-Catalyzed Sequential Three-Component Cascade
作者:B. S. Vachan、Muthu Karuppasamy、Gowsia Jan、Nattamai Bhuvanesh、C. Uma Maheswari、Vellaisamy Sridharan
DOI:10.1021/acs.joc.0c00893
日期:2020.6.19
A sequential three-component cascade process was developed for the synthesis of bridged tetrahydroquinolines and chromanes bearing 2,6-methanobenzo[d][1,3]diazocine and 2,6-methanobenzo[g][1,3]oxazocine scaffolds, respectively, in good yields from readily available materials. The InCl3-catalyzed reaction progressed via enamine formation, Michael addition, intramolecular cyclization, and intramolecular
开发了一种顺序三组分级联方法,分别合成带有2,6-甲基苯并[ d ] [1,3]二重氮和2,6-甲基苯并[ g ] [1,3]恶唑啉骨架的桥联四氢喹啉和苯并二氢吡喃。,从容易获得的材料中获得高产量。InCl 3催化的反应通过烯胺形成,迈克尔加成,分子内环化和分子内亚胺离子环化步骤进行。值得注意的是,这种高原子经济方法(−2H 2 O)允许生成四个新键(1 C–C和3 C–N或1 C–C,1 C–O和2 C–N)和两个杂环在一次操作中。