l-Proline promoted Ullmann-type reaction of vinyl bromides with imidazoles in ionic liquids
作者:Zhiming Wang、Weiliang Bao、Yong Jiang
DOI:10.1039/b501628b
日期:——
The Ullmann-type coupling reaction of vinyl bromides and imidazoles in ILs at 90–110 °C gave the corresponding N-vinylimidazoles in good to excellent yields by using L-proline as the ligand; the double bond geometry of the vinyl bromides was retained under the reaction conditions.
CuI-Catalyzed Cross-Coupling
Reaction of (<i>E</i>)-Vinyl Bromides with
Nitrogen-Containing Heterocycles
作者:Jincheng Mao、Qiongqiong Hua、Jun Guo、Daqing Shi、Shunjun Ji
DOI:10.1055/s-2008-1077955
日期:——
An efficient and straightforward copper-catalyzed method allowing vinylation of N-nucleophiles with various substituted (E)-vinyl bromides under palladium-free and ligand-free conditions has taken a high yield (up to 95%). Noteworthy is that the double-bond geometry of these vinyl halides was retained with our protocol.
Iron-Catalyzed Cross-Coupling Reaction of Vinyl Bromides or Chlorides with Imidazoles in the Absence of Ligands and Additives
作者:Jincheng Mao、Guanlei Xie、Jiaming Zhan、Qiongqiong Hua、Daqing Shi
DOI:10.1002/adsc.200900066
日期:2009.6
Abstractmagnified imageHighly effective coupling of imidazoles with (E)‐vinyl halides can be achieved by using readily available iron catalysts under ligand‐free, copper‐free and palladium‐free conditions. Coupling of (E)‐vinyl bromides led to (Z)‐products predominantly, while the reactions of (E)‐vinyl chlorides afforded (E)‐isomers as the major products.
BOURGEOIS P.; LUCRESE J.; DUNOGUES J., J. HETEROCYCL. CHEM., 1978, 15, NO 8, 1543-1545