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光诱导钌催化的自由基接力远程双C(sp³)-H / C(sp³)-H官能团化反应

Photo-Induced Ruthenium-Catalyzed Double Remote C(sp )-H / C(sp )-H Functionalizations by Radical Relay.

作者信息

Wang Yulei, Chen Shan, Chen Xinran, Zangarelli Agnese, Ackermann Lutz

机构信息

Institut für Organische und Biomolekulare Chemie and Wöhler Research Institute for Sustainable Chemistry (WISCh), Georg-August-Universität, Tammanstraße 2, 37077, Göttingen, Germany.

Department of Chemistry, Zhejiang University, Hangzhou, 310027, China.

出版信息

Angew Chem Int Ed Engl. 2022 Aug 8;61(32):e202205562. doi: 10.1002/anie.202205562. Epub 2022 Jun 10.

Abstract

Distal C(sp )-H and C(sp )-H functionalizations have recently emerged as step-economical tools for molecular synthesis. However, while the C(sp )-C(sp ) construction is of fundamental importance, its formation through double remote C(sp )-H/C(sp )-H activation has proven elusive. By merging the ruthenium-catalyzed meta-C(sp )-H functionalization with an aliphatic hydrogen atom transfer (HAT) process, we, herein, describe the catalyzed twofold remote C(sp )-H/C(sp )-H functionalizations via photo-induced ruthenium-mediated radical relay. Thus, meta-C(sp )-H arene bonds and remote C(sp )-H alkane bonds were activated by a single catalyst in a single operation. This process was accomplished at room temperature by visible light-notably without exogenous photocatalysts. Experimental and computational theory studies uncovered a manifold comprising ortho-C-H activation, single-electron-transfer (SET), 1,n-HAT (n=5-7) and σ-activation by means of a single ruthenium(II) catalyst.

摘要

远端C(sp³)-H和C(sp²)-H官能团化最近已成为分子合成中步骤经济的工具。然而,虽然C(sp³)-C(sp²)构建至关重要,但通过双远程C(sp³)-H/C(sp²)-H活化形成它已被证明难以实现。通过将钌催化的间位C(sp²)-H官能团化与脂肪族氢原子转移(HAT)过程相结合,我们在此描述了通过光诱导钌介导的自由基接力实现的催化双远程C(sp³)-H/C(sp²)-H官能团化。因此,间位C(sp²)-H芳烃键和远程C(sp³)-H烷烃键在一次操作中由单一催化剂活化。该过程在室温下通过可见光完成,值得注意的是无需外源光催化剂。实验和计算理论研究揭示了一个包括邻位C-H活化、单电子转移(SET)、1,n-HAT(n = 5 - 7)以及通过单一钌(II)催化剂进行σ-活化的反应历程。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/faad/9401009/f3f92f36dd9d/ANIE-61-0-g006.jpg

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