Direct Formation of Tethered Ru(II) Catalysts Using Arene Exchange
摘要:
An 'arene exchange' approach has been successfully applied for the first time to the synthesis of Ru(II)-based 'tethered' reduction catalysts directly from their ligands in one step. This provides an alternative method for the formation of known complexes, and a route to a series of novel complexes. The novel complexes are highly active in both asymmetric transfer and pressure hydrogenation of ketones.
Synthesis of Enantiomerically Pure and Racemic Benzyl-Tethered Ru(II)/TsDPEN Complexes by Direct Arene Substitution: Further Complexes and Applications
作者:Rina Soni、Katherine E. Jolley、Silvia Gosiewska、Guy J. Clarkson、Zhijia Fang、Thomas H. Hall、Ben N. Treloar、Richard C. Knighton、Martin Wills
DOI:10.1021/acs.organomet.7b00731
日期:2018.1.8
The use of a direct arene-exchange method for the synthesis of benzyl-tethered arene/Ru/TsDPEN complexes for use in asymmetric transfer hydrogenation is reported. A series of complexes tethered through a three-carbon linear chain was also prepared. The arene-exchange approach significantly simplifies the synthetic approach to this class of catalyst and permits the ready formation of modified analogues
A very efficient two‐step synthesis was developed to prepare the keyintermediate in Corey's Tamiflu synthesis. DBU (1,8‐diazabicyclo[5.4.0] undec‐7‐ene) was used as a multifunctional catalyst for a series of reactions in a one pot procedure. The new synthesis was featured by the good availability of the starting material and the ease of the synthetic steps. This method might be practical for large
The invention relates to a method for synthesising tethered ruthenium catalysts and novel tethered ruthenium catalysts obtainable by this methods. The method involves carrying out an “arene swapping” reaction avoiding the requirement to use complicated techniques making use of unreliable Birch reductions and unstable cyclodienyl intermediates.