- Chan-Lam cross-coupling reaction based on the Cu2S/TMEDA system
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A catalyst based on the readily available Cu2S/TMEDA system using a stable copper(I) source was developed for the Chan-Lam cross-coupling reaction. The capability of the catalyst was demonstrated with 1H-benzo[d]imidazol-2(3H)-one, 1H-benzo[d]imidazole, and 1H-imidazole together with electron-deficient, electron-rich, and sterically demanding boronic acids at room temperature in the presence of atmospheric oxygen to give the cross-coupling products in moderate to excellent yields. In addition, the coupling reaction of 1H-benzo[d]imidazole with several pinacol or neopentylglycol boronates indicated further potential of the catalyst. The reaction conditions tolerate the hydroxyl and bromo functional groups. The catalytic system also enables to synthesize the mono-N-substituted anilines from primary aliphatic amines. However, the two model compounds for the secondary and aromatic amines, piperidine and aniline, do not react. Two sterically demanding products with the restricted C–N bond rotation, synthesized by the N-arylation of 1H-benzo[d]imidazol-2(3H)-one with o-tolylboronic acid, enabled to confirm the atropisomers prepared by the Chan-Lam cross-coupling reaction. Furthermore, an example of one-pot Chan-Lam and Suzuki-Miyaura reaction has been reported.
- Janíková, Kate?ina,Jedinák, Luká?,Volná, Tereza,Canka?, Petr
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p. 606 - 617
(2018/01/01)
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- N -heterocyclic carbenes: Versatile second cyclometalated ligands for neutral iridium(III) heteroleptic complexes
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With 2-(2,4-difluorophenyl)pyridine (dfppy) as the first cyclometalated ligand and different monoanionic N-heterocyclic carbenes (NHCs) as the second cyclometalated ligands, 16 blue or greenish-blue neutral iridium(III) phosphorescent complexes, (dfppy)s
- Li, Tian-Yi,Liang, Xiao,Zhou, Liang,Wu, Chen,Zhang, Song,Liu, Xuan,Lu, Guang-Zhao,Xue, Li-Sha,Zheng, You-Xuan,Zuo, Jing-Lin
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p. 161 - 173
(2015/03/03)
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- Ligand-free copper-catalysed coupling reaction of heteroaryl bromides with imidazole and benzimidazole
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The synthesis of N-heteroarylimidazoles by coupling heteroaryl bromides with imidazole or benzimidazole under relatively mild conditions using the stable and readily available copper(II) acetate as catalyst and cesium carbonate as base is reported to give products in moderate to good yields.
- Wu, Xiang-Mei,Wang, Yan
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experimental part
p. 555 - 557
(2010/01/16)
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- Highly efficient and practical phosphoramidite-copper catalysts for amination of aryl iodides and heteroaryl bromides with alkylamines and N(H)-heterocycles
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A highly efficient copper-catalyzed system using phosphoramidite as ligands was applied to N-arylation of alkylamines and N(H)-heterocycles with aryl iodides and heteroaryl bromides. The reactions were carried out in relative mild conditions and good to excellent yields were obtained.
- Zhang, Zhanjin,Mao, Jincheng,Zhu, Di,Wu, Fan,Chen, Huilin,Wan, Boshun
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p. 4435 - 4443
(2007/10/03)
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- Copper promoted C-N and C-O bond cross-coupling with phenyl and pyridylboronates
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Acyclic and cyclic esters, as well as anhydride (boroxine) of phenylboronic acids are efficient phenylating agents in copper promoted C-N and C-O bond cross-coupling reactions. The first successful C-N cross-coupling of a heterocyclic boronate with heteroarenes, such as indazole, has been demonstrated.
- Chan, Dominic M. T.,Monaco, Kevin L.,Li, Renhua,Bonne, Damien,Clark, Charles G.,Lam, Patrick Y. S.
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p. 3863 - 3865
(2007/10/03)
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