Tailoring flavins for visible light photocatalysis: organocatalytic [2+2] cycloadditions mediated by a flavin
Viktor Mojr1, Eva Svobodová, Karolína Straková
1Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague, Czech Republic. cibulkar@vscht.cz.
Abstract:
A new application of flavin derivatives in visible light photocatalysis was found. 1-Butyl-7,8-dimethoxy-3-methylalloxazine, when irradiated by visible light, was shown to allow an efficient cyclobutane ring formation via an intramolecular [2+2] cycloaddition of both styrene dienes, considered as electron-rich substrates, and electron-poor bis(arylenones), presumably proceeding via an energy transfer mechanism.
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