Synthesis of 6-Fluoroalkyl 6H-Benzo[c]chromenes via Visible-Light-Promoted Radical Addition/Cyclization of Biaryl Vinyl Ethers
2018
Deng, Qinfei | Tan, Liping | Xu, Yan | Liu, Ping | Sun, Peipei
A novel visible-light-promoted cascade cyclization reaction for the synthesis of 6-fluoroalkyl 6H-benzo[c]chromenes has been successfully realized, which was initiated by intermolecular radical addition to biaryl vinyl ethers using easily available fluoroalkylated reagents BrCF₂CO₂Et or 2-bromo-2,2-difluoroamides as the sources of fluorinated radicals, followed by the cyclization onto an aromatic ring process. This protocol tolerated a wide range of functional groups and provided the desired products in moderate to good yields.
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