Asymmetric Ruthenium-Catalyzed Hydrogenation of Terpyridine-Type <i>N</i>-Heteroarenes: Direct Access to Chiral Tridentate Nitrogen Ligands
作者:Chenghao Li、Yixiao Pan、Yu Feng、Yan-Mei He、Youran Liu、Qing-Hua Fan
DOI:10.1021/acs.orglett.0c02268
日期:2020.8.21
first enantioselective hydrogenation of terpyridine-type N-heteroarenes has been successfully developed by using Ru(diamine) complexes as catalysts, providing partially reduced chiral pyridine-amine-type products in high yield (up to 93%) with excellent diastereo- and enantioselectivity (up to 94:6 dl/meso, > 99% ee). These pyridine-amine-type compounds can be served as a new class of chiral multidentate
Synthesis of 2,6-di(1,8-naphthyridin-2-yl)pyridines functionalized at the 4-position: Building blocks for suitable metal complex-based dyes
作者:Shunsuke Nakamura、Tsugiko Takase、Dai Oyama
DOI:10.1080/00397911.2019.1597123
日期:2019.6.3
methoxy-substituted 2,6-di(1,8-naphthyridin-2-yl)pyridine using Friedländer methodology. The functionalization at the 4-carbon of the methoxy-substituted derivative was confirmed by X-ray structural analysis. Finally, the methyl ether protecting group was cleaved to obtain 2,6-di(1,8-naphthyridin-2-yl)pyridine-4-ol. Using the compounds, coordination behavior to ruthenium(II) center was also examined. Graphical
摘要 本研究报告了使用 Friedländer 方法合成甲氧基取代的 2,6-二(1,8-萘啶-2-基)吡啶。X 射线结构分析证实了甲氧基取代衍生物的 4-碳上的官能化。最后,甲基醚保护基被裂解得到2,6-二(1,8-萘啶-2-基)吡啶-4-醇。使用这些化合物,还研究了与钌 (II) 中心的配位行为。图形概要
Novel Late Transition Metal Catalysts Based on Iron: Synthesis, Structures and Ethylene Polymerization
作者:Gholam Hossein Zohuri、Seyed Mohammad Seyedi、Reza Sandaroos、Saman Damavandi、Ali Mohammadi
DOI:10.1007/s10562-010-0433-x
日期:2010.12
In this article we reported synthesis, characterization and ethylene polymerization behavior of two new late transition metal 2,6-bis(imino)pyridine catalysts based on iron(II) possessing different substituents of NO(2) (catalyst b) and OMe (catalyst c) at the para position of the pyridine ring. Theoretical study exhibited more positive charge on the central metal of the catalyst b, leading to higher activity offset by lower thermal stability and life time.