Highly Enantioselective Transfer Hydrogenation of Prochiral Ketones Using Ru(II)-Chitosan Catalyst in Aqueous Media
作者:György Szőllősi、Vanessza Judit Kolcsár
DOI:10.1002/cctc.201801602
日期:2019.1.23
Unprecedentedly high enantioselectivities are obtained in the transferhydrogenation of prochiral ketones catalyzed by a Ru complex formed in situ with chitosan chiral ligand. This biocompatible, biodegradable chiral polymer obtained from the natural chitin afforded good, up to 86 % enantioselectivities, in the aqueous‐phase transferhydrogenation of acetophenone derivatives using HCOONa as hydrogen donor. Cyclic
在与壳聚糖手性配体原位形成的Ru络合物催化的前手性酮的转移氢化中,获得了前所未有的高对映选择性。这种从天然几丁质中获得的生物相容性,可生物降解的手性聚合物,在使用HCOONa作为氢供体的苯乙酮衍生物的水相转移氢化中,提供了高达86%的良好对映选择性。环酮的对映选择性更高,超过90%,而在杂环酮的转移氢化中,进一步增加,最高可达97%。手性催化剂前体制备易地通过扫描电子显微镜,FT-中期和-far-IR光谱法检测。原位结构通过1 H NMR光谱和使用各种壳聚糖衍生物研究了形成的催化剂。结果表明,Ru预催化剂是通过氨基将生物聚合物与金属配位而形成的。加入氢供体后,该前体转化为水不溶性钌氢化物络合物。通过以高收率和光学纯度制备二十多种手性醇,验证了所开发方法的实用价值。在单次结晶后,将催化剂用于以克为单位获得光学纯的手性醇。
Mechanochemical, Water‐Assisted Asymmetric Transfer Hydrogenation of Ketones Using Ruthenium Catalyst
作者:Vanessza Judit Kolcsár、György Szőllősi
DOI:10.1002/cctc.202101501
日期:2022.2.8
The first highly efficient, aqueous phase mechanochemical asymmetrictransferhydrogenation of prochiral ketones is reported using in situ formed Noyori-Ikariya Ru-complex and sodium formate as hydrogen donor in ball mill.
Asymmetric Hydrogenation of Ketones and Enones with Chiral Lewis Base Derived Frustrated Lewis Pairs
作者:Bochao Gao、Xiangqing Feng、Wei Meng、Haifeng Du
DOI:10.1002/anie.201914568
日期:2020.3.9
The concept of frustratedLewispairs (FLPs) has been widely applied in various research areas, and metal-free hydrogenation undoubtedly belongs to the most significant and successful ones. In the past decade, great efforts have been devoted to the synthesis of chiral boron Lewis acids. In a sharp contrast, chiral Lewisbase derived FLPs have rarely been disclosed for the asymmetric hydrogenation.
The invention provides a novel α-halogen-substituted thiophene compound salt that has a potent LPA receptor antagonistic action and is useful as a medicament.
The salt is represented by the general formula (I):
(wherein R is a hydrogen atom or a methoxy group; X is a halogen atom; A is selected from the group consisting of:
M is an alkali metal or an alkaline earth metal; and n is 1 when M is an alkali metal and is 2 when M is an alkaline earth metal).
本发明提供了一种新型α-卤代噻吩化合物盐,它具有强效的 LPA 受体拮抗作用,可用作药物。
该盐由通式(I)表示:
(其中 R 是氢原子或甲氧基;X 是卤素原子;A 选自以下组成的组:
M 是碱金属或碱土金属;当 M 是碱金属时,n 为 1;当 M 是碱土金属时,n 为 2)。
Halogen-substituted heterocyclic compound
申请人:UBE INDUSTRIES, LTD.
公开号:US10000463B2
公开(公告)日:2018-06-19
A novel α-halogen-substituted thiophene compound or a pharmacologically acceptable salt thereof, which has a potent LPA receptor-antagonist activity and is useful as a medicament is provided.