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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Ambient Construction of Quinazoline-Linked Covalent Organic Frameworks via Solar-Driven Intrinsic Photochemical
Fei Li1, Yi-Hao Zhang1, Bing-Jian Yao1
1College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Normal University, Jinan 250014, P. R. China.
Abstract:
Although solar-driven organic synthesis is highly attractive, its application in materials synthesis is still in its infancy and faces great challenges. Herein, we present the first sunlight-driven, photosensitizer-free strategy for constructing quinazoline-linked covalent organic frameworks (QZCOFs) via photochemical aromatization under ambient conditions. This approach enables the scalable synthesis of highly crystalline and robust QZCOFs featuring well-defined conjugated structures. The resulting QZCOF-1 possesses a donor-acceptor (D-A) architecture and serves as an efficient, metal-free heterogeneous photocatalyst for diverse organic transformations, including selective sulfide oxidation, benzimidazole formation, and tetrahydroquinoline synthesis via C-H annulation. This strategy not only opens a promising paradigm for the green and sustainable synthesis of COFs but also demonstrates their potential as multifunctional platforms for photocatalysis.
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