A new dinuclear chiral salen complexes for asymmetric ring opening and closing reactions: Synthesis of valuable chiral intermediates
作者:Santosh Singh Thakur、Shu-Wei Chen、Wenji Li、Chang-Kyo Shin、Seong-Jin Kim、Yoon-Mo Koo、Geon-Joong Kim
DOI:10.1016/j.jorganchem.2005.12.044
日期:2006.4
A new dinuclear chiral Co(salen) complexes bearing group 13 metals have been synthesized and characterized. The easily prepared complexes exhibited very high catalytic reactivity and enantioselectivity for the asymmetric ring opening of epoxides with H2O, chloride ions and carboxylic acids and consequently provide enantiomerically enriched terminalepoxides (>99% ee). It also catalyzes the asymmetric
Chiral Bifunctional Metalloporphyrin Catalysts for Kinetic Resolution of Epoxides with Carbon Dioxide
作者:Chihiro Maeda、Mayato Mitsuzane、Tadashi Ema
DOI:10.1021/acs.orglett.9b00447
日期:2019.3.15
triazolium halide units were synthesized as bifunctional catalysts for kinetic resolution of epoxides with CO2. Several catalysts were screened by changing the linker length and nucleophilic counteranions, and the optimized catalyst accelerated the enantioselective reaction at ambient temperature to produce optically active cyclic carbonates and epoxides.
Thiazolidine and oxazolidine derivatives, their preparation and their
申请人:Sankyo Company, Limited
公开号:US05578620A1
公开(公告)日:1996-11-26
Compounds of formula (I): ##STR1## and salts, esters and solyates thereof and pro-drugs therefor are useful for the treatment and/or prophylaxis of a variety of disorders, including one or more of: hyperlipemia, hyperglycemia, obesity, glucose tolerance insufficiency, insulin resistance and diabetic complications.
Jacobsen-type enantioselective hydrolysis of aryl glycidyl ethers.<sup>31</sup>P NMR analysis of the enantiomeric composition of oxiranes
作者:A. A. Bredikhin、E. I. Strunskaya、V. G. Novikova、N. M. Azancheev、D. R. Sharafutdinova、Z. A. Bredikhina
DOI:10.1023/b:rucb.0000024851.29744.21
日期:2004.1
The enantioselective partial hydrolysis of a number of racemic arylglycidylethers in the presence of chiral Co(salen)-catalyst was studied. The enantiomeric composition of the isolated (R)-aryl glycidylethers was analyzed by 31P NMR using optically active substituted 2-chloro-1,3,2-dioxaphospholanes. A synthesis of β-adrenoblocking agents (S)-toliprolol and (S)-moprolol based on the simultaneously
Hydrolytic Kinetic Resolution of Terminal Epoxides catalyzed by Novel Bimetallic Chiral Co (Salen) Complexes
作者:Rahul B. Kawthekar、Geon‐Joong Kim
DOI:10.1080/00397910701872658
日期:2008.3.28
complexes bearing transition-metal salts have been synthesized. The easily prepared complexes exhibited very high catalytic reactivity and enantioselectivity in hydrolytic kinetic resolution (HKR) of racemicterminalepoxides and consequently provided enantiomericallyenrichedepoxides (up to 99% ee).
已经合成了带有过渡金属盐的新型双金属手性 Co (salen) 配合物。容易制备的配合物在外消旋末端环氧化物的水解动力学拆分 (HKR) 中表现出非常高的催化反应性和对映选择性,因此提供了对映异构体富集的环氧化物(高达 99% ee)。