Copper(I) Oxide/<i>N</i>
,<i>N′</i>
-Bis[(2-furyl)methyl]oxalamide-Catalyzed Coupling of (Hetero)aryl Halides and Nitrogen Heterocycles at Low Catalytic Loading
作者:Govind Goroba Pawar、Haibo Wu、Subhadip De、Dawei Ma
DOI:10.1002/adsc.201700026
日期:2017.5.17
An easily prepared oxalic diamide is a powerful ligand for the copper‐catalyzed coupling of aryl halides with nitrogen heterocycles. Only 1–2 mol% each of copper(I) oxide and N,N′‐bis[(2‐furyl)methyl]oxalamide (BFMO) are needed to form N‐arylation products under mild conditions. More than 10 different types of nitrogen heterocycles are compatible with these conditions, thereby giving the corresponding
Iron complex-catalyzed N-arylation of pyrazoles under aqueous medium
作者:Hang Wai Lee、Albert S.C. Chan、Fuk Yee Kwong
DOI:10.1016/j.tetlet.2009.08.018
日期:2009.10
diamine ligand is a highly effective catalyst for N-arylation of pyrazoles using aryl and heteroaryl iodides. It is notable to show that this complex is tolerable under aqueous medium and particularly the whole reaction utilizes water as the sole solvent without any additional organic co-solvents and surfactants. Attempted study using other nitrogennucleophiles is described. This newly developed system provides
effective bidentate ligand able to promote the Ullmann-type copper-catalyzed coupling of aryl halides with heteroaromatic or aliphatic amines. Furfuryl alcohol (FA) can be mixed with water to form the corresponding azeotrope (20 wt% of FA) and therefore can be easily recovered and reused. This protocol is efficiently applied to substrates with various electronic nature and affords the expected products
<scp>l</scp>-Proline Promoted Ullmann-Type Coupling Reactions of Aryl Iodides with Indoles, Pyrroles, Imidazoles or Pyrazoles
作者:Dawei Ma、Qian Cai
DOI:10.1055/s-2003-44995
日期:——
The Ullmann-type coupling reactions of aryl iodides and several nitrogen heterocycles occur at 80-90 °C with L-proline as additive, giving N-arylpyrroles, N-arylindoles, N-arylimidazoles, and N-pyrazoles in good to excellent yields.
芳基碘化物和几个氮杂环的 Ullmann 型偶联反应在 80-90 °C 下发生,L-脯氨酸作为添加剂,得到 N-芳基吡咯、N-芳基吲哚、N-芳基咪唑和 N-吡唑,产率良好至极好。