Synthesis of Spiro Diphosphines and Their Application in Asymmetric Hydrogenation of Ketones
摘要:
Synthesis of chiral diphosphine ligands containing a spiro scaffold was described. The ruthenium complexes of these spiro ligands were found to have extremely high activities (S/C up to 100 000) and enantioselectivities (ee up to 99.5%) in the asymmetric hydrogenation of aromatic, heteroaromatic, and alpha,beta-unsaturated ketones.
A process for producing an optically active amine compound, characterized by asymmetrically hydrogenating a prochiral carbon-nitrogen double bond in the presence of a ruthenium complex represented by general formula (1) or (2) (wherein P
represents an optically active diphosphine, X represents an anionic group, and Ar represents an optionally substituted arylene group).
RUTHENIUM COMPLEX AND METHOD FOR PREPARING OPTICALLY ACTIVE ALCOHOL COMPOUND
申请人:Nara Hideki
公开号:US20130041151A1
公开(公告)日:2013-02-14
The present invention provides a novel ruthenium complex which has an excellent catalytic activity in terms of reactivity for asymmetric reduction of a carbonyl compound and enantioselectivity, a catalyst using the ruthenium complex, and a method for preparing optically active alcohol compounds using the ruthenium complex. The present invention relates to a ruthenium complex having ruthenacycle structure, a catalyst for asymmetric reduction consisting of the ruthenium complex, and a method for preparing optically active alcohol using the ruthenium complex.
NOVEL RUTHENIUM COMPLEX AND PROCESS FOR PRODUCING OPTICALLY ACTIVE ALCOHOL COMPOUND USING SAME AS CATALYST
申请人:Hori Kiyoto
公开号:US20140187809A1
公开(公告)日:2014-07-03
The present invention provides a novel ruthenium complex which has an excellent catalytic activity in terms of reactivity for an asymmetric reduction of a carbonyl compound and enantioselectivity, a catalyst using the ruthenium complex, and a method for preparing optically active alcohol compounds using the ruthenium complex. The present invention relates to a ruthenium complex having a ruthenacycle structure, a catalyst for an asymmetric reduction consisting of the ruthenium complex, and a method for preparing optically active alcohol compounds using the ruthenium complex.
pure enantiomers, with aims other than the determination of the absolute structure. Taking advantage of the greater propensity of quasi-racemic mixtures to co-crystallize compared to growing enantiomerically pure crystals of a single compound, we herein describe the use of X-ray crystallography of quasi-racemates for the absoluteconfigurationdetermination. We expect that this approach is particularly
通过 X 射线晶体学确定手性分子实体的绝对构型在立体化学中总体上具有核心重要性。然而,对映体纯单晶的生长往往是一个无法逾越且令人沮丧的障碍。生物大分子的准外消旋晶体,其绝对构型由手性单体预先确定,允许对难以结晶为纯对映异构体的系统进行 X 射线晶体学分析,其目的不是确定绝对结构。与生长单一化合物的对映体纯晶体相比,利用准外消旋混合物共结晶的更大倾向,我们在此描述了使用准外消旋体的 X 射线晶体学确定绝对构型。
Method for the production of praziquantel and precursors thereof
申请人:Merck Patent GmbH
公开号:US10273213B2
公开(公告)日:2019-04-30
The present invention provides methods of preparing Praziquantel, in particular (R)-Praziquantel and analogues thereof in a stereoselective manner. One method involves asymmetric hydrogenation of the following intermediate compound
and subsequent cyclization.