Rh(<scp>ii</scp>)-catalyzed Doyle–Kirmse reaction: access to unprotected 3-allyl/3-allenyl-3-(thio)oxindoles
作者:Xunbo Lu、Kaiyuan Yang、Xinyu Xu、Siyu Sun、Shanqing Feng、Muhammad Adnan Bashir、Fangpeng Liang、Jie Lin、Guoling Huang
DOI:10.1039/d2ob01729f
日期:——
3-allyl/3-allenyl-3-(thio)oxindole core remains a challenge in organic synthesis. Herein, we report a novel Rh2(esp)2 catalytic Doyle–Kirmse reaction to furnish the oxindole core, bearing unbiased NH as well as a quaternary stereogenic center at the 3-position, in good to excellent yields under mild conditions. These reactions are concise, practical, atom-economic, and highly efficient, and feature a TON
3-烯丙基/3-烯基-3-(硫代)羟吲哚核心的构建仍然是有机合成中的一个挑战。在此,我们报告了新型 Rh2(esp)2 催化 Doyle-Kirmse 反应,以提供 oxindoles 核心,在 3 位具有无偏的 NH 和四元立体中心,在温和条件下具有良好至优异的产率。这些反应具有简洁、实用、原子经济、高效和 TON 高达 3700 的特点。此外,在该方法中观察到非自由基途径。