Allylation of N-Heterocycles with Allylic Alcohols Employing Self-Assembling Palladium Phosphane Catalysts
摘要:
The first palladium catalyst system that allows the direct allylation of indoles with allylic alcohols as substrates with water being the only byproduct is presented. The application of self-assembing ligands based on complementary hydrogen bonding was the key to success.
Cooperative Effect of a Classical and a Weak Hydrogen Bond for the Metal-Induced Construction of a Self-Assembled β-Turn Mimic
作者:Andy C. Laungani、Manfred Keller、John M. Slattery、Ingo Krossing、Bernhard Breit
DOI:10.1002/chem.200900662
日期:2009.10.12
means of unprecedented multiple noncovalent interactions (classical hydrogenbond, weakhydrogenbond, metal coordination, π‐stacking interaction) was developed and investigated. Our results address the importance and capability of weakhydrogen bonds (WHBs) as important attractive interactions in self‐assembling processes based on molecularrecognition. Together with a classical hydrogenbond, WHBs may
The present invention relates to a process for hydroformylating in the presence of a catalyst comprising at least one complex of a metal of transition group VIII with mono-phosphorus compounds which are capable of dimerizing via noncovalent bonds as ligands, to such catalysts and to their use.
The first chiral ligand library based on self-assembly through complementary hydrogen-bonding was realized. From a 10 x 4 ligand library, catalysts that show excellent activity and enantioselectivity for the asymmetric rhodium-catalyzed hydrogenation have been identified.
实现了第一个基于互补氢键自组装的手性配体库。从 10 x 4 配体库中,已鉴定出对不对称铑催化氢化显示出优异活性和对映选择性的催化剂。
Mechanistic insight into the ruthenium-catalysed anti-Markovnikov hydration of alkynes using a self-assembled complex: a crucial role for ligand-assisted proton shuttle processes
作者:Bernhard Breit、Urs Gellrich、Timothy Li、Jason M. Lynam、Lucy M. Milner、Natalie E. Pridmore、John M. Slattery、Adrian C. Whitwood
DOI:10.1039/c4dt00712c
日期:——
nucleophilic attack of water at the vinylidene α-carbon and mediates protonation and deprotonation of subsequent acyl and vinyl intermediates. Experimental evidence is also presented for a novel non-productive catalyst deactivation pathway, which appears to arise from an initial lactam–lactim tautomerism of the 3-DPICon ligand followed by coupling with a vinylidene.
Self-Assembled Bidentate Ligands for Ruthenium-Catalyzed Hydration of Nitriles
作者:Tomáš Šmejkal、Bernhard Breit
DOI:10.1021/om0611047
日期:2007.4.1
Novel bis(acetylacetonato)ruthenium(II) complexes bearing the 6-diphenylphosphino-N-pivaloyl-2-aminopyridine and 3-diphenylphosphinoisoquinolone ligands were synthesized. Molecular structures of these complexes were studied in solution and also in the solid state, and unusual hydrogen-bonding patterns were identified. The prepared compounds constitute active catalysts for the hydration of nitriles