Journal
ORGANIC CHEMISTRY FRONTIERS
Volume 9, Issue 15, Pages 4135-4145Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2qo00710j
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Funding
- National Natural Science Foundation of China [21901027, 21901029]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJQN201901345, KJQN201901346, KJQN202101338]
- Scientific Research Foundation of the Chongqing University of Arts and Sciences [R2019FXY11, R2021FYX04]
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A photosensitizer-free strategy for direct C-H difluoroalkylation of quinoxalinones and hydrazones via a visible-light-promoted C-sp(3)-Br bond homolytic pathway is disclosed. This process provides access to difluoroalkylated quinoxaline and hydrazone derivatives with excellent substrate generality under simple, mild, green, and metal-free conditions.
Disclosed herein is a photosensitizer-free strategy for the direct C-H difluoroalkylation of quinoxalinones and hydrazones with bromodifluoroacylarenes via a visible-light-promoted C-sp(3)-Br bond homolytic pathway. This new reaction provides access to difluoroalkylated quinoxaline and hydrazone derivatives with excellent substrate generality under simple, mild, green, and metal-free conditions. This process exploits the fascinating photochemical activity of bromodifluoroacylarenes in the homolysis of C-sp(3)-Br bonds to form difluoroalkyl radicals and bromine radical species. The generated bromine radicals can mediate H abstraction/imine radical formation directly from quinoxalinones and hydrazones, which in turn quench the in situ-generated difluoroalkyl radicals to furnish the products. It is of note is that this is the first example of the application of bromine radicals in organic transformation via C-sp(3)-Br bond homolysis induced by visible light. Moreover, the minimal structural requirements for alkyl bromide-mediated photochemical C-sp(3)-Br bond homolysis were investigated.
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