Visible-light excitation of iminium ions enables the enantioselective catalytic β-alkylation of enals
作者:Mattia Silvi、Charlie Verrier、Yannick P. Rey、Luca Buzzetti、Paolo Melchiorre
DOI:10.1038/nchem.2748
日期:2017.9
organisms. Herein we demonstrate that the direct excitation of chiral iminium ions can unlock unconventional reaction pathways, enablingenantioselective catalytic photochemical β-alkylations of enals that cannot be realized via thermal activation. The chemistry uses readily available alkyl silanes, which are recalcitrant to classical conjugateadditions, and occurs under illumination by visible-light-emitting
Asymmetric Photocatalytic C–H Functionalization of Toluene and Derivatives
作者:Daniele Mazzarella、Giacomo E. M. Crisenza、Paolo Melchiorre
DOI:10.1021/jacs.8b05240
日期:2018.7.11
from the corresponding enals. The process combines the oxidative power of a chiral excited-state iminium ion and the basic nature of its counteranion to trigger the generation of benzylic radicals by means of a sequential multisite proton-coupled electron transfer mechanism. This study shows that feedstock chemicals generally used as solvents, such as toluene and xylene derivatives, can be used as