for exceptional catalytic turnover numbers (up to 15 400), which were increased by around 1.5–3 orders of magnitude compared to the most active catalysts previously reported. In our concept an aprotic ammonium halide moiety cooperates with an oxophilic Lewisacid within the same catalyst molecule. Control experiments reveal that both catalytic centers are essential for the observed activity. Kinetic
[EN] HYDROGENATION OF ESTERS OR CARBONYL GROUPS WITH TETRADENTATE AMINO/IMINO-THIOETHER BASED RUTHENIUM COMPLEXES<br/>[FR] HYDROGÉNATION DE GROUPES ESTERS OU CARBONYLES AVEC DES COMPLEXES DU RUTHÉNIUM À BASE D'AMINO/IMINO-THIOÉTHER TÉTRADENTATE
申请人:FIRMENICH & CIE
公开号:WO2012084810A1
公开(公告)日:2012-06-28
The present invention relates to the field of catalytic hydrogenation and, more particularly, to the use of specific ruthenium catalysts, or pre-catalysts, in hydrogenation processes for the reduction of ketones and/or aldehydes into the corresponding alcohol respectively. Said catalysts are ruthenium complexes comprising a tetradentate ligand (L4) coordinating the ruthenium with: - two nitrogen atoms, each in the form of a primary or secondary amine (i.e. a NH2 or NH group) or N-alkyl imine functional groups (i.e. a C=N group), and - two sulfur atoms, each in the form of thioether functional groups.
A new route to the optically active allyl alcohols by microbial oxidation is disclosed. Yamadazyma farinosa IFO 10896, a yeast, efficiently catalyzes the enantioselective oxidation of allyl alcohols to afford the corresponding optically active alcohols as the remaining substrates. This reaction is applicable to both cyclic and acyclic compounds.
Use of Tunable Ligands Allows for Intermolecular Pd-Catalyzed C−O Bond Formation
作者:Andrei V. Vorogushin、Xiaohua Huang、Stephen L. Buchwald
DOI:10.1021/ja050471r
日期:2005.6.1
Pd-catalyzed C-O coupling reactions of aryl halides with primary and secondary alcohols by promoting reductive elimination at the expense of beta-hydride elimination. The key to their success is the ability to match the size of the ligand to that of the combination of substrates. The efficient coupling of a number of unactivated aryl chlorides and bromides with cyclic and acyclicsecondary alcohols was achieved
庞大的联芳基膦配体通过促进还原消除以消除 β-氢化物为代价,促进了 Pd 催化的芳基卤化物与伯醇和仲醇的 CO 偶联反应。它们成功的关键是能够将配体的大小与底物组合的大小相匹配。实现了许多未活化的芳基氯化物和溴化物与环状和非环状仲醇的有效偶联。这包括首次在 Pd 催化的偶联过程中偶联烯丙醇。
Synthetic efforts towards the tricyclic framework of avenaol
作者:Kai Kikuchi、Christopher S.P. McErlean
DOI:10.1016/j.tetlet.2021.153003
日期:2021.4
occurring strigolactone, avenaol, was generated in just 7 steps from a readily available starting material. The key reaction in the sequence was a photoredox-catalyzed functionalization of a dibromocyclopropane. Although this delivered the epimeric stereochemistry at the cyclopropane, it informs future directions in strigolactone synthesis.