期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2021, 期 31, 页码 4485-4489出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.202100868
关键词
Cascade; cyclization; Difluoroalkylation; Photocatalysis; Polycyclic imidazoles; Radicals
A visible light promoted difluoroalkylated cascade reaction of imidazoles and alkenes was reported, providing highly functionalized polycyclic imidazoles. The method allows for a direct radical cyclization of imidazoles with alkenes using BrCF2R as radical sources, with up to 95% isolated yield under mild conditions. Radical-trapping and light-on/off experiments suggested a photocatalytic radical mechanism.
We reported herein a visible light promoted difluoroalkylated cascade of imidazoles and alkenes to afford highly functionalized polycyclic imidazoles. This method features a direct radical cyclization of imidazoles with alkenes using BrCF2R as radical sources. The reaction conditions tolerate a wide range of substrate scope and afford the desired products with up to 95 % isolated yield under mild conditions. Radical-trapping and light-on/off experiments indicated a photocatalytic radical mechanism.
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