Two new iodide-containing derivatives of the widely-adopted arene/Ru(II)/TsDPEN catalysts have been prepared and fully characterised, including through X-ray crystallography. They have been evaluated as catalysts for the asymmetric reduction of acetophenone under both transfer (ATH) and pressure hydrogenation (AH) conditions. The iodide-containing complexes are equally efficient in the ATH reaction, but less active in the AH reaction compared to the chloride derivatives. (C) 2014 Elsevier B.V. All rights reserved.
Synthesis and Catalytic Applications of an Extended Range of Tethered Ruthenium(II)/η6-Arene/Diamine Complexes
摘要:
A series of novel enantiopure Ru(II) complexes containing a chiral diamine and eta(6)-arene connected by a tethering group have been prepared and were evaluated in the asymmetric reductions of a range of ketones. Changes to the level of steric hindrance and the addition of an electron withdrawing functionality on the sulfonyl group have a significant effect on the reactivity and enantioselectivity of the catalysts.
A Class of Ruthenium(II) Catalyst for Asymmetric Transfer Hydrogenations of Ketones
作者:Aidan M. Hayes、David J. Morris、Guy J. Clarkson、Martin Wills
DOI:10.1021/ja051486s
日期:2005.5.25
Ruthenium dimer 6 (readily available in two steps from TsDPEN) is converted directly to monomeric asymmetric transfer hydrogenation catalyst 3 in situ under the conditions employed for ketone reduction. Catalyst 3 is a significantly more active catalyst for this application than the untethered derivative, exhibits higher enantioselectivities across a range of substrates, and appears to be highly stable
[EN] PROCESS FOR PREPARING TETRACYCLIC HETEROCYCLE COMPOUNDS<br/>[FR] PROCÉDÉ DE PRÉPARATION DE COMPOSÉS HÉTÉROCYCLIQUES TÉTRACYCLIQUES
申请人:MERCK SHARP & DOHME
公开号:WO2015065821A1
公开(公告)日:2015-05-07
The present invention is directed to a process for preparing Tetracyclic Heterocycle Compounds of formula (I): which are useful as HCV NS5A inhibitors. The present invention is also directed to compounds that are useful as synthetic intermediates for making the compounds of formula (I).