Cu2O acting as a robust catalyst in CuAAC reactions: water is the required medium
作者:Kai Wang、Xihe Bi、Shuangxi Xing、Peiqiu Liao、Zhongxue Fang、Xianyu Meng、Qian Zhang、Qun Liu、Yu Ji
DOI:10.1039/c0gc00848f
日期:——
Cu2O as the catalyst in water was found to be quite robust for the azide-alkyne cycloaddition (AAC) reaction, which was verified by a wide variety of applicable azides and alkynes. Water was proved to play an essential role because of a significant rate acceleration compared with reactions using organic solvents and conducted under neat conditions. The high catalytic performance of Cu2O/H2O system was further argued by decreasing the catalyst loading to ppm levels.
Synthesis of 6-Substituted Piperidin-3-ones via Rh(II)-Catalyzed Transannulation of <i>N</i>-Sulfonyl-1,2,3-triazoles with Electron-Rich Aromatic Nucleophiles
作者:Yang Li、Ran Zhang、Arshad Ali、Jing Zhang、Xihe Bi、Junkai Fu
DOI:10.1021/acs.orglett.7b01180
日期:2017.6.16
A highly diastereoselective rhodium(II)-catalyzed transannulation of aldehyde-tethered N-sulfonyl triazoles with electron-rich aromatic nucleophiles is reported for the first time to afford functionalized 6-substituted piperidin-3-ones. The reaction has a broad substrate scope including both aliphatic and aromatic N-sulfonyl-1,2,3-triazoles together with various aromatic nucleophiles. The addition
Stereoselective Synthesis of Oxabicyclo[2.2.1]heptenes via a Tandem Dirhodium(II)-Catalyzed Triazole Denitrogenation and [3 + 2] Cycloaddition
作者:Hao Yuan、Jianxian Gong、Zhen Yang
DOI:10.1021/acs.orglett.6b02703
日期:2016.11.4
A novel synthetic strategy for the diastereoselective synthesis of structurally diverse oxabicyclo[2.2.1]heptenes has been developed, featuring a tandemreaction combining a Rh-catalyzed triazole denitrogenation and a novel type of [3 + 2] cycloadditionreaction. This tandemreaction was thought to proceed via a five-membered oxonium ylide intermediate, which was formed by the intramolecular nucleophilic
A rhodium-catalyzed tandem reaction of N-sulfonyl triazoles with indoles: access to indole-substituted indanones
作者:Hao Yuan、Jianxian Gong、Zhen Yang
DOI:10.1039/c7cc05139e
日期:——
An efficient strategy for the synthesis of structurally diverse indole-substituted indanones via a rhodium(II)-catalyzed tandemreaction of N-sulfonyltriazoles with indoles was developed. The reaction involves rhodium(II)-catalyzed denitrogenation of the N-sulfonyltriazoles to form an oxonium ylide, followed by nucleophilic addition of the indoles and subsequent skeletal rearrangement. This strategy
Novel 10π-electron cyclic amidines with excellent fluorescence properties were synthesized by a general and efficient 6π-electrocyclic ring closure of ketenimine and imine starting fromN-sulfonyl triazoles and arylamines.