Synthesis of a New Class of<i>C</i><sub>2</sub>-Symmetrical Biheteroaryls by Ammonium Cerium(IV) Nitrate Mediated Dimerization of 2-(Furan-3-yl)pyrroles
作者:Benito Alcaide、Pedro Almendros、Rocío Carrascosa、M. Rosario Torres
DOI:10.1002/ejoc.200901314
日期:2010.2
Polyfunctionalized 2-(furan-2-yl)pyrroles and 2-(furan-3-yl)-pyrroles derived from 2-azetidinone-tethered allenes by two independent cerium(IV)-mediated single-electron oxidations provided a (4-oxopent-2-enoyl)pyrrole and 3,3'-bis(pyrrol-2-yl)-2,2'-bifurans, respectively. Access to the oxidation precursors was achieved by regiocontrolled cyclization of β-al-lenamine intermediates derived from selective β-lactam
多官能化的 2-(呋喃-2-基)吡咯和 2-(呋喃-3-基)-吡咯通过两个独立的铈 (IV) 介导的单电子氧化从 2-氮杂环丁酮连接的丙二烯衍生得到 (4-oxopent -2-烯酰基)吡咯和3,3'-双(吡咯-2-基)-2,2'-二呋喃分别。获得氧化前体是通过β-烯丙胺中间体的区域控制环化来实现的,该中间体源自2-氮杂环丁酮系烯醇的选择性β-内酰胺核断裂。