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Visible-Light-Induced Alkynylation of α-C-H Bonds of Ethers with Alkynyl Bromides without External Photocatalyst

Xiaofei Xie  刘杰  Lei Wang  Pinhua Li  Min Wang  
【摘要】:Visible-light-induced C-H functionalization has emerged as one of the most active research topics in sustainable organic synthesis,which are associated with low energy consumption,concise route and mild conditions.~1 Some photoreactions require photosensitizers,such as organic dyes or metal complexes while others can proceed without additional photo sensitizers.With our previous experience of visible-light-induced organic transformations in the absence of an external photosensitizer,~2 we herein report a visible-light-induced α-position C-H activation and alkynylation of ethers with alkynyl bromides to generate the corresponding α-alkynyl ethers in good yields at room temperature with broad substrate scope in the absence of any external photocatalyst.The value of this efficient and eco-friendly methodology for the synthesis of α-alkynyl ethers has been highlighted via the ability to perform the reaction at room temperature by visible light irradiation protocol.

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