Visible-Light-Enabled Oxidative Coupling of Alkenes with Dialkylformamides To Access Unsaturated Amides
作者:Maojian Lu、Zhaowei Lin、Shanyi Chen、Hongyou Chen、Mingqiang Huang、Shunyou Cai
DOI:10.1021/acs.orglett.9b03870
日期:2019.12.20
A practical and direct method for oxidative cross-coupling of alkenes with dialkylformamides is established employing visible-light-enabled photoredox catalysis. This strategy allows efficient access to diverse unsaturated amides under mild reaction conditions. The application of an appropriate diaryliodonium salt was demonstrated to be critical to the success of this process. This catalyst system
bromides from the corresponding 1,1-diarylethylenes. This protocol not only provides a convenient and straightforward strategy for the rapid construction of various 2,2-diarylvinyl bromides without bromine and extra oxidants, but also can improve the atom economy of Kornblum oxidative reaction.
Organocatalytic reductive coupling of aldehydes with 1,1-diarylethylenes using an <i>in situ</i> generated pyridine-boryl radical
作者:Jia Cao、Guoqiang Wang、Liuzhou Gao、Xu Cheng、Shuhua Li
DOI:10.1039/c7sc05225a
日期:——
reductive couplingreaction of aldehydes with 1,1-diarylethylenes has been established via a combination of computational and experimental studies. Density functional theory calculations and control experiments suggest that the ketyl radical from the addition of the pyridine-boryl radical to aldehydes is the key intermediate for this C–C bond formation reaction. This metal-free reductive coupling reaction
Lewis Acid Catalyzed Ring‐Opening Reaction of Cyclobutanones towards Conjugated Enones
作者:Min Zhang、Jiqiang Gao、Jinbo Zhao、Tingtian Qiu、Zhongjuan Li、Ziteng Guo、Chunhui Liu、Yu Liu
DOI:10.1002/ejoc.202101335
日期:2021.12.7
An unprecedented Fe-catalyzed ring-opening reaction of simple cyclobutanones was disclosed. Such a novel approach givesaccess to substituted conjugate enones with good functional group tolerance in high yields under mild conditions.
Visible-Light-Promoted Trifluoromethylthiolation of Styrenes by Dual Photoredox/Halide Catalysis
作者:Roman Honeker、R. Aleyda Garza-Sanchez、Matthew N. Hopkinson、Frank Glorius
DOI:10.1002/chem.201600190
日期:2016.3.18
report a new visible‐light‐promoted strategy to access radical trifluoromethylthiolation reactions by combining halide and photoredoxcatalysis. This approach allows for the synthesis of vinyl–SCF3 compounds of relevance in pharmaceutical chemistry directly from alkenes under mild conditions with irradiation from household light sources. Furthermore, alkyl–SCF3‐containing cyclic ketone and oxindole