Direct, enantioselective α-alkylation of aldehydes using simple olefins
作者:Andrew G. Capacci、Justin T. Malinowski、Neil J. McAlpine、Jerome Kuhne、David W. C. MacMillan
DOI:10.1038/nchem.2797
日期:2017.11
olefins as coupling partners. Chiral imidazolidinones or prolinols, in combination with a thiophenol, iridium photoredox catalyst and visible light, have been successfully used in a triple catalytic process that is temporally sequenced to deliver a new hydrogen and electron-borrowing mechanism. This multicatalytic process enables both intra- and intermolecular aldehyde α-methylene coupling with olefins
Visible-Light-Promoted Intramolecular α-Allylation of Aldehydes in the Absence of Sacrificial Hydrogen Acceptors
作者:Jia-Li Liu、Jia-Lin Tu、Feng Liu
DOI:10.1021/acs.orglett.0c02742
日期:2020.9.18
We report herein an unprecedented protocol for radical cyclization of aldehydes with pendant alkenes via synergistic photoredox, cobaloxime, and amine catalysis. The transformation was achieved in the absence of external oxidants, providing a variety of 5-, 6-, and 7-membered ring products with alkene transposition in satisfactory yields. The reaction exhibits wide functional group compatibility and occurs under mild conditions with extrusion of H-2.