Photo-Fenton-Like (Trideutero)methylation Reaction of N/O Heterocycles with DMSO(-d6) Induced by EDA Complex Photocatalysis

Abstract

DMSO is a prominent and indispensable methylating agent within the realm of organic synthesis. We report an innovative strategy employing in situ generated EDA (Electron-Donor-Acceptor) complexes as an active photocatalyst to achieve N/O heterocycle (deutero)methylation based on DMSO(-d6). Mechanistic investigations reveal that the reaction proceeds through the synergistic action of the EDA active catalyst, water, and oxygen, inducing the formation of hydroxyl radicals in a Fenton-like process. Compared to traditional Fenton-based methylation reactions utilizing DMSO, this approach circumvents the necessity for metal catalysts and strong oxidants, thereby exhibiting significant enhancements in environmental friendliness, safety, and economy. Furthermore, a variety of N/O heterocycles, including azauracils, quinoxalinones, and coumarins, are compatible with the reaction system, which was previously unattainable in conventional Fenton methylation reactions.

Supplementary files

Article information

Article type
Paper
Submitted
21 Nov 2024
Accepted
02 Apr 2025
First published
29 Apr 2025

Green Chem., 2025, Accepted Manuscript

Photo-Fenton-Like (Trideutero)methylation Reaction of N/O Heterocycles with DMSO(-d6) Induced by EDA Complex Photocatalysis

C. Qin, C. Li, F. Gao, J. Wang, Z. Zhang, S. Zhang, X. Li, Y. Sun, M. Hu, S. Wang, F. Ji and G. Jiang, Green Chem., 2025, Accepted Manuscript , DOI: 10.1039/D4GC05939E

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