Rhodium(III)-Catalyzed Sequential Cyclization of <i>N</i>-Boc Hydrazones with Propargylic Monofluoroalkynes via C–H Activation/C–F Cleavage for the Synthesis of Spiro[cyclobutane-1,9′-indeno[1,2-<i>a</i>]indenes]
作者:Cheng Deng、Lu Jiang、Jinzhong Yao、Qian Liang、Lin Miao、Changchang Li、Maozhong Miao、Hongwei Zhou
DOI:10.1021/acs.joc.2c00372
日期:2022.5.6
An effective rhodium(III) catalysis for the construction of valuable tetracyclic compounds is described herein. This domino process involving the C–H activation/[3 + 2] annulation/intramolecular Friedel–Crafts reaction sequences of simple and readily available N-Boc hydrazones and propargylic monofluoroalkynes afforded fused tetracyclic spiro[cyclobutane-1,9′-indeno[1,2-a]indenes] in moderate to good
本文描述了用于构建有价值的四环化合物的有效铑(III)催化剂。这种多米诺骨牌过程涉及简单且容易获得的N -Boc 腙和炔丙基单氟炔烃的 C-H 活化/[3 + 2] 环化/分子内 Friedel-Crafts 反应序列,得到稠合四环螺[环丁烷-1,9'-茚并[1 ,2- a ]茚] 具有中等至良好的产率,具有三个 C-C 键的形成。此外,对照实验表明 C-H 活化可能参与速率决定步骤。