作者:Huan‐Ming Huang、Peter Bellotti、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/anie.202011996
日期:2021.2
Carbonyl propargylation has been established as a valuable tool in the realm of carbon–carbon bond forming reactions. The 1,3‐enyne moiety has been recognized as an alternative pronucleophile in the above transformation through an ionic mechanism. Herein, we report for the first time, the radical carbonyl propargylation through dual chromium/photoredox catalysis. A library of valuable homopropargylic
Functionalization of Pyridinium Derivatives with 1,4-Dihydropyridines Enabled by Photoinduced Charge Transfer
作者:Inwon Kim、Seongjin Park、Sungwoo Hong
DOI:10.1021/acs.orglett.0c03347
日期:2020.11.6
By exploiting electron donor–acceptor (EDA) complexes between 1,4-dihydropyridines and N-amidopyridinium salts under visible light irradiation, we discovered that photoinduced intermolecular charge transfer induces a single-electrontransfer event without requiring a photocatalyst for the facile functionalization of pyridines. The generality of this method is amenable to various types of 1,4-dihydropyridines
Photoredox‐Catalyzed Addition of Carbamoyl Radicals to Olefins: A 1,4‐Dihydropyridine Approach
作者:Luana Cardinale、Mikhail O. Konev、Axel Jacobi von Wangelin
DOI:10.1002/chem.202002410
日期:2020.7.2
alkene carbamoylations. Readily accessible 4‐carboxamido‐Hantzsch esters serve as convenient starting materials that generate carbamoyl radicals upon visible light‐mediated single‐electron transfer. Addition to various alkenes proceeded with high levels of regio‐ and chemoselectivity.
Herein we present a photocatalyst- and additive-free radical hydroacylation of electron-poor double bonds under mild reaction conditions. Using 4-acyl-Hantzsch ester radical reservoirs, various Michaelacceptors, enones and para-quinone methide substrates could be used. The protocol enabled further derivatizations and it could also be extended to a few unactivated alkenes. Moreover, the nature of the
Trifluoromethylation of Carbonyl and Unactivated Olefin Derivatives by C(
<i>sp</i>
<sup>
<i>3</i>
</sup>
)−C Bond Cleavage
作者:Fei Cong、Riccardo S. Mega、Jinhong Chen、Craig S. Day、Ruben Martin
DOI:10.1002/anie.202214633
日期:2023.4.3
A Cu-mediated trifluoromethylation of carbonyl-type compounds and unactivatedolefins enabled by visible-light irradiation via σ C(sp3)−C bond-functionalization has been developed. This protocol is characterized by its modularity, mild conditions and wide scope—even in the context of late-stage functionalization, thus offering a complementary approach en route to valuable C(sp3)−CF3 architectures from