Wang Yulei, Chen Shan, Chen Xinran, Zangarelli Agnese, Ackermann Lutz
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.
Angew Chem Int Ed Engl. 2022 Aug 8;61(32):e202205562. doi: 10.1002/anie.202205562. Epub 2022 Jun 10.
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.
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。