Ligand Substitution of Ru
<sup>II</sup>
–Alkylidenes to Ru(bpy)
<sub>3</sub>
<sup>2+</sup>
: Sequential Olefin Metathesis/Photoredox Catalysis
作者:Malte Gallhof、Lukas Kell、Malte Brasholz
DOI:10.1002/chem.201905694
日期:2020.2.6
Ruthenium(II) alkylidene complexes such as the Grubbs' 1st and 2nd generation catalysts undergo a ligand substitution with 2,2'-bipyridine, which readily leads to the common photoredox catalyst Ru(bpy)3 2+ . The application of this catalyst transformation in sequential olefin metathesis/photoredoxcatalysis is demonstrated by way of ring-closing metathesis (RCM)/photoredox ATRA reactions.
A strategy for the synthesis of functionalized indenes is presented. The readily available substituted phenols are used as starting materials in the reaction sequence composed of Pd-catalyzed Suzuki coupling and Ru-catalyzed ring-closing metathesis, thus representing a practical method for the controlled construction of functionalized indene derivatives. The methodology has been successfully applied
of new chiralauxiliaries, 7-alkyl substituted cis-1-amino-2-indanol derivatives, was established by the Diels–Alder reaction of 1-substituted dienes with cyclopentenone followed by the asymmetric epoxidation of the resulting indene derivatives and then the Ritter reaction. These bulky cis-aminoindanol derivatives are very effective as chiralauxiliaries and nitrogen sources in the asymmetric 6π-azaelectrocyclization
Synthesis and structure of [1,2-bis(1-indenyl)benzene]titanium and zirconium dichlorides
作者:Ronald L Halterman、Alexander Tretyakov、Masood A Khan
DOI:10.1016/s0022-328x(98)00753-0
日期:1998.10
2-bis(1-indenyl)benzenes in 29–45% yield. New phenyl-bridged ansa-bis(indenyl)titanium and -zirconium dichlorides were obtained from these ligands in good yield either by addition of TiCl3 or ZrCl4 to their lithium salts (61–92% yield) or by addition of Zr(NMe2)4 to the neutral ligands (59–67%). In each case the zirconium tetraamide metalation gave very high dl-selectivity. The n-BuLi/ZrCl4 metalation
The design and synthesis of novel IBiox N-heterocyclic carbeneligands derived from substituted amino-indanols
作者:Jean-Noël Levy、Christopher M. Latham、Loïc Roisin、Nadine Kandziora、Paolo Di Fruscia、Andrew J. P. White、Simon Woodward、Matthew J. Fuchter
DOI:10.1039/c1ob06780j
日期:——
(NHC) ligands has been developed. The resulting ligands have restricted flexibility and high steric demand. Preliminary studies have shown these ligands to give high levels of asymmetricinduction in the copper-free allylicalkylation of cinnamyl bromide.