Synthesis of <i>cis</i>-Octahydroindoles via Intramolecular 1,3-Dipolar Cycloaddition of 2-Acyl-5-aminooxazolium Salts
作者:Corey H. Basch、Jameson A. Brinck、Joaquin E. Ramos、Stephen A. Habay、Glenn P.A. Yap
DOI:10.1021/jo301600p
日期:2012.11.16
products contain 2-amido and 7-hydroxyl substituents. A series of 2-acyl-5-aminooxazoles were prepared in one step. Upon methylation of the oxazole nitrogen atom, the substrates underwent rapid intramolecular 1,3-dipolar cycloaddition with a tethered alkene and, after reduction with excess hydride, produced octahydroindoles with excellent diastereoselectivity. The method allows for the installation
提出了一种简便的非对映选择性合成八氢吲哚的方法。该产物含有2-酰胺基和7-羟基取代基。一步制备一系列2-酰基-5-氨基恶唑。在恶唑氮原子甲基化后,对底物进行快速的分子内1,3-偶极环加成反应,并用束缚的烯烃进行加成反应,并用过量的氢化物还原后,生成具有出色的非对映选择性的八氢吲哚。该方法允许安装α-季生立体碳原子。