A General Organocatalytic System for Enantioselective Radical Conjugate Additions to Enals
作者:Emilien Le Saux、Dengke Ma、Pablo Bonilla、Catherine M. Holden、Danilo Lustosa、Paolo Melchiorre
DOI:10.1002/anie.202014876
日期:2021.3
enantioselective conjugate addition of carbon‐centered radicals to aliphatic and aromatic enals. The process uses an organic photoredox catalyst, which absorbs blue light to generate radicalsfrom stable precursors, in combination with a chiral amine catalyst, which secures a consistently high level of stereoselectivity. The generality of this catalytic platform is demonstrated by the stereoselective interception
photocatalytic Giese‐type reaction with alkylsilicates bearing C,O‐bidentate ligands as stable alkyl radical precursors has been reported. The alkylsilicates were prepared in one step from organometallic reagents. Not only primary, secondary, and tertiary alkyl radicals, but also elusive methyl radicals, could be generated by using the present reaction system. The generated radicals were trapped by electron‐deficient
Trifluoromethylated thermally activated delayed fluorescence molecule as a versatile photocatalyst for electron-transfer- and energy-transfer-driven reactions
trifluoromethylated thermally activated delayed fluorescent molecule 4[Cz(CF3)2]IPN is a versatile organic photocatalyst that can be used for electron-transfer-driven reactions requiring a photocatalyst with high oxidizing power and energy-transfer-driven reactions that require an Ir photocatalyst. 4[Cz(CF3)2]IPN was used in radical reactions via electron transfer and dearomative cycloaddition reactions via energy