Gold-Catalyzed Rearrangement of α-Carbonyl Cyclopropanes to Form 3-(Cyclopenta-1,3-dien-1-ylmethyl)oxindoles via a Postulated 1,5-Enolate Shift
作者:Amit Vijay Sasane、Tung-Chun Kuo、Mu-Jeng Cheng、Rai-Shung Liu
DOI:10.1021/acs.orglett.2c02117
日期:2022.7.22
Gold-catalyzed stereoselective synthesis of spirocyclopropyl oxindoles from diazooxindoles and 1,2,4-substituted dienes is described. The aim of this work is to report a novel rearrangement of these spirocyclopropyl oxindoles with a gold catalyst to yield 3-(cyclopenta-1,3-dien-1-ylmethyl)oxindoles. Our experimental data exclude a reversible process in the gold-catalyzed cyclopropanation. With DFT
描述了由重氮吲哚和 1,2,4-取代二烯催化的螺环丙基羟吲哚的立体选择性合成。这项工作的目的是报告这些螺环丙基羟吲哚与金催化剂的新重排,以产生 3-(cyclopenta-1,3-dien-1-ylmethyl)oxindoles。我们的实验数据排除了金催化环丙烷化中的可逆过程。通过 DFT 计算,我们假设重排机制涉及形成复杂的金烯醇化物和 1-亚甲基-2,3,4-环戊二烯基阳离子,导致 1,5-烯醇化物移位。