CuI-Catalyzed Amination of Arylhalides with Guanidines or Amidines: A Facile Synthesis of 1-<i>H</i>-2-Substituted Benzimidazoles
作者:Xiaohu Deng、Heather McAllister、Neelakandha S. Mani
DOI:10.1021/jo900912h
日期:2009.8.7
CuI/L5 (N,N′-dimethylethylenediamine) proves to be an efficient catalyst system for the amination of arylhalides with guanidines. The same catalyst system is then successfully applied to the one-step synthesis of 1-H-2-amino-benzimidazoles through tandem aminations of 1,2-dihaloarenes in modest yields. This methodology is also applicable for the preparation of 1-H or 1-substutituted 2-aryl- or 2-alkyl-benzimidazoles
事实证明,CuI / L5(N,N'-二甲基乙二胺)是一种用于将芳基卤化物与胍胺化的有效催化剂体系。然后将相同的催化剂体系成功地通过1,2-二卤代芳烃的串联胺化以适度的产率成功地一步合成1- H -2-氨基-苯并咪唑。该方法学也可用于制备1- H或1-取代的2-芳基-或2-烷基-苯并咪唑。
Manganese‐Catalyzed
<i>ortho‐</i>
Alkenylation of Aromatic Amidines with Alkynes via C−H Activation
作者:Teng Jia、Congyang Wang
DOI:10.1002/cctc.201900387
日期:2019.11.7
The first ortho‐alkenylation of aromatic amidines with alkynes was realized by earth‐abundant manganese catalysis through C−Hactivation. A catalytic amount of PhMgBr was found essential for improved efficiency of this transformation. Wide tolerance of functional groups and excellent E/Z selectivity highlighted the current protocol.
Rhodium-catalyzed multiple C–H activation/highly<i>meta</i>-selective C–H amination between amidines and alkynes
作者:Fen Xu、Yuan-Yuan Song、Wen-Jing Zhu、Chun-Sen Liu、Ya-Zhou Lu、Miao Du
DOI:10.1039/d0cc04885b
日期:——
A tandem process of multiple C–H activation and intermolecular highly meta-selective C–H amination betweenamidines and alkynes has been developed. Mechanistic studies demonstrate that the reaction is proposed to proceed through two different Rh(I)–Rh(III) catalytic cycles, wherein Rhodium-complex I and Rhodacycle intermediate II were isolated for the first time.
Metal‐Free Cascade 1,4‐Conjugate Addition/Selective Annulation Strategy for Divergent Synthesis of Polysubstituted Imidazoles and 4‐Alkenylquinazolines
作者:Qiang Tang、Keke Xu、Xinwei He、Yongjia Shang
DOI:10.1002/adsc.202200905
日期:2022.12.8
metal-free cascade annulation of propagylamines with amidines for divergent synthesis of polysubstituted imidazoles and 4-alkenylquinazolines has been developed. The reaction is believed to proceed by sequential 1,4-conjugate addition of amidines to propargylamines, 5-exo-dig annulation/aromatization to form the polysubstituted imidazoles, and nucleophilic addition/elimination/aromatization to quinazoline