Chromium(0)-Catalyzed Tandem Cyclization of α,β-Unsaturated Thioimidates Containing an Enyne Moiety
作者:Yusuke Karibe、Hiroyuki Kusama、Nobuharu Iwasawa
DOI:10.1002/anie.201201505
日期:2012.6.18
1‐azabicyclo[5.3.0]decane derivatives proceeds through 1,7‐electrocyclization of the zwitterionic intermediates that are formed in the cyclization of α,β‐unsaturated thioimidatescontaining an enynemoiety (see scheme). Furthermore 1,4‐addition of nucleophiles to α,β‐unsaturated carbene complex intermediates was also achieved.
A Sonogashira cross-coupling, nucleophilic substitution and elimination cascade reaction allows the synthesis of otherwise difficult to obtain linear dienynes, in moderate to high yields. Ionic liquids are suitable recyclable solvents for the reaction. This synthetic strategy opens new ways to prepare highly conjugated alkenes and alkynes.
Copper-Catalyzed Asymmetric Allylation of <i>N</i>-Aryl Aldimines
作者:Yu-Qin Deng、Qi-Qi Yan、Ting-Ting Zhang、Yi Zhou、Cheng-Yu He、Quan-Zhong Liu
DOI:10.1021/acs.joc.3c02035
日期:2024.1.5
The copper-catalyzed enantioselective allylation reaction of N-aryl aldimines has been developed using a combination of Cu(OAc)2 and SPINOL-based phosphonamidite. This protocol significantly broadens the substrate scope, such that imines bearing various ortho-substituents on the N-aryl were converted smoothly into homoallylic amines in up to 99% yield and 98% ee. Taking advantage of the diversity of
TMSOTf-Catalyzed [4 + 2] Annulation of Ynamides and β-(2-Aminophenyl)-α,β-ynones for the Synthesis 2-Aminoquinolines
作者:Chaofan Qi、Xiaoxiao Shen、Wozheng Fang、Junbiao Chang、Xiao-Na Wang
DOI:10.1021/acs.orglett.4c00763
日期:2024.5.3
A metal-free TMSOTf-catalyzed [4 + 2] annulation of ynamides with β-(2-aminophenyl)-α,β-ynones enables the regiospecific and facile assembly of 2-aminoquinoline frameworks. The catalyst TMSOTf presented a remarkable advancement compared to previously reported transition-metal catalysts. A wide range of 3-aryl/alkyl-substituted 2-aminoquinolines were generated in moderate to excellent yields due to