Copper(I)-Catalyzed Aryl or Vinyl Addition to Electron-Deficient Alkenes Cascaded by Cationic Cyclization
摘要:
An exoselective copper-catalyzed arylation and vinylation-carbocyclization of electron-deficient alkenes was developed to provide rapid and efficient access to a variety of functionalized 3,3-disubstituted oxindoles. With this method, a highly efficient and concise formal synthesis of (+/-)-physostigmine and (+/-)-physovenine has been completed.
Copper-catalyzed bis-arylations of alkenes leading to oxindole derivatives
作者:Liangliang Shi、Yuyuan Wang、Haijun Yang、Hua Fu
DOI:10.1039/c4ob00576g
日期:——
A simple and practical copper-catalyzed approach to oxindole derivatives by copper-catalyzed bis-arylation of N-alkyl-N-phenylacrylamides with diaryliodonium triflates has been developed under mild conditions, and the method is of tolerance towards some functional groups in the substrates.
A novel and efficient copper-catalyzed tandem oxidative cyclization of arylacrylamides with diaryliodonium salts is reported. This reaction provides a novel approach for the synthesis of oxindoles and various functional groups were well tolerated.
Asymmetric synthesis of oxindoles containing a quaternary stereogenic centre by catalytic O/C-carboxyl rearrangement
作者:Muhammad Ismail、Huy V. Nguyen、Gennadiy Ilyashenko、Majid Motevalli、Christopher J. Richards
DOI:10.1016/j.tetlet.2009.08.122
日期:2009.11
A catalysed O/C-carboxyl rearrangement generates the all-carbon stereogeniccentre in phenyl 1,3-dimethyl-5-methoxy-2-oxoindoline-3-carboxylate (up to 57% ee). Crystallisation and removal of racemic crystals enhance the ee to 95%. The X-ray crystal structure of the cobalt metallocene–pyrrolidinopyridine nucleophilic catalyst employed is reported.
<i>Endo</i>/<i>Exo</i>-Controllable Photocyclization by EnT-SET-Switch
作者:Xian-Peng Cai、Bin-Hong Han、Fu-Tong Cen、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.orglett.3c00837
日期:2023.4.28
CBZ6, a redox-neutral non-donor–acceptor-type organo-photocatalyst, presents a strong reductive potential with an oxidative potential of −2.16 V (vs SCE). It can work as a photosensitizer for both single-electron transfer and triplet energy transfer processes. This feature enables site-selective control in the intramolecular hydroarylation of acrylamides. Both 5-exo-trig and 6-endo-trig cyclization
Cu(OTf)(2)-catalyzed diarylation of activated alkenes by using diaryliodonium(III) salts has been developed. With this method, arylated oxindoles can be easily accessed in good yields. Insights into the mechanism of copper-catalyzed arylations are discussed, and the findings are expected to help increase the level of understanding of catalytic arylations with diaryliodonium salts.