4-HO-TEMPO-Catalyzed Redox Annulation of Cyclopropanols with Oxime Acetates toward Pyridine Derivatives
作者:Jun-Long Zhan、Meng-Wei Wu、Dian Wei、Bang-Yi Wei、Yu Jiang、Wei Yu、Bing Han
DOI:10.1021/acscatal.9b00832
日期:2019.5.3
for the synthesis of pyridines through the annulation of cyclopropanols and oxime acetates has been developed. This protocol features good functional group tolerance and high chemoselectivity and also promises to be efficient for the late-stage functionalization of skeletons of drugs and natural products. Mechanism studies indicate that the reaction involves the in situ generated α,β-unsaturated ketones
Phosphine Ligand‐Free Ruthenium Complexes as Efficient Catalysts for the Synthesis of Quinolines and Pyridines by Acceptorless Dehydrogenative Coupling Reactions
作者:Bin Guo、Tian‐Qi Yu、Hong‐Xi Li、Shi‐Qi Zhang、Pierre Braunstein、David J. Young、Hai‐Yan Li、Jian‐Ping Lang
DOI:10.1002/cctc.201900435
日期:2019.5.20
corresponding ligand in EtOH. Five Ru(II) complexes [LRu(DMSO‐κS)Cl2] (2 a: L=L1; 2 b: L=L2; 2 c: L=L3; 2 d: L=L4; 2bMe: L=L2Me) were formed by reducing the corresponding Ru(III) complex in refluxing EtOH. The latter complexes could also be prepared directly by refluxing Ru(DMSO)4Cl2 with the corresponding ligand in EtOH. These Ru(III) and Ru(II) complexes, especially 1 b/2 b, exhibited high catalytic
Copper-catalyzed direct C–H arylation of pyridineN-oxides with arylboronic esters for the one-pot synthesis of 2-arylpyridines without an additional reductant.
Synthesis of Asymmetrical 2,6-Diarylpyridines from Linear α,β,γ,δ-Unsaturated Ketones by Addition of Ammonium Formate Followed by Annulation
作者:Yejun Gao、Rener Chen、Yongmin Ma
DOI:10.1055/s-0037-1610725
日期:2019.10
established for the synthesis of asymmetrical 2,6-diarylpyridines by cyclization of α,β,γ,δ-unsaturated ketones with ammonium formate under air atmosphere. The reaction is metal-free and operationally convenient from readily available starting materials. Thirty-three examples have been presented, most of which show good yields. A simple and efficient method has been established for the synthesis of asymmetrical
The present invention relates to metal complexes and to elec
tronic devices, in particular organic electroluminescent devices, com-pris
ing these metal complexes. M(L)n(L′)m (formula 1), where the compound of the gene
ral formula (1) contains a moiety M(L)n of the formula (2).