1,1′-Bis(oxazolinyl)ferrocene-based palladium catalysts: Synthesis, X-ray structures and applications in Suzuki and Heck coupling reactions
摘要:
1,1'-Bis(oxazolinyl)ferrocene-based palladium dichloride complexes 2a and 2b were synthesized. X-ray single-crystal diffraction analyses showed that they are of the N,N'-chelating type, and that the coordination mode of 2a, which has an isopropyl group, is of the cis type, whereas that of 2b, which has a tert-butyl group, is the trans one. These two complexes were employed as catalysts for Suzuki and Heck reactions, and showed high catalytic activities in coupling reactions with various aryl halides and counterparts (phenylboronic acid or n-butyl acrylate). Particularly, the catalyst 2a afforded the coupled product of aryl bromide with phenylboronic acid at room temperature. (c) 2005 Elsevier B.V. All rights reserved.
Rhodium(II)-Catalyzed Nondirected Oxidative Alkenylation of Arenes: Arene Loading at One Equivalent
作者:Harit U. Vora、Anthony P. Silvestri、Casper J. Engelin、Jin-Quan Yu
DOI:10.1002/anie.201310539
日期:2014.3.3
bimetallic RhII catalyst promoted the CH alkenylation of simple arenes at 1.0 equivalent without the use of a directing group. A phosphine ligand as well as cooperative reoxidation of RhII with Cu(TFA)2 and V2O5 proved essential in providing monoalkenylated products in good yields and selectivities, especially with di‐ and trisubstituted arenes.
双金属的Rh II催化剂促进与c H在1.0当量,而无需使用定向基团的简单的芳烃的烯基化。膦配体以及Rh II与Cu(TFA)2和V 2 O 5的协同再氧化被证明对于以高收率和选择性提供单烯基化产物至关重要,特别是对于二取代和三取代的芳烃。
2-Hydroxy-1,10-phenanthroline vs 1,10-Phenanthroline: Significant Ligand Acceleration Effects in the Palladium-Catalyzed Oxidative Heck Reaction of Arenes
作者:Cheng-Hao Ying、Shao-Bai Yan、Wei-Liang Duan
DOI:10.1021/ol4033804
日期:2014.1.17
A series of bidentate monoanionic nitrogen ligands were designed and applied in the Pd-catalyzed oxidative Heck reaction of arenes with alkenes. Significant ligand-accelerated effects were observed, and direct C-H functionalized products were formed in high yields with meta-selectivity.