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
Chiral Nanoporous Metal–Metallosalen Frameworks for Hydrolytic Kinetic Resolution of Epoxides
作者:Chengfeng Zhu、Guozan Yuan、Xu Chen、Zhiwei Yang、Yong Cui
DOI:10.1021/ja302340b
日期:2012.5.16
recyclable heterogeneous catalyst for hydrolytickineticresolution (HKR) of racemic epoxides with up to 99.5% ee. The MOF structure brings Co(salen) units into a highly dense arrangement and close proximity that enhances bimetallic cooperative interactions, leading to improved catalytic activity and enantioselectivity in HKR compared with its homogeneous analogues, especially at low catalyst/substrate ratios
Aminoalcohol derivatives and their use as beta 3 adrenergic agonists
申请人:Fujisawa Pharmaceutical Co. Ltd.
公开号:US20020143034A1
公开(公告)日:2002-10-03
A compound of the formula (I):
1
wherein X
1
is bond or —OCH
2
—;
X
2
is —(CH
2
)
n
—, in which n is
1, 2
or
3;
X
3
is bond, —O—, —S—, —OCH
2
—, or —NH—;
R
1
is phenyl or pyridyl each of which may have one or two substituent(s) selected from the group consisting of hydroxy, halogen, etc.;
R
2
is hydrogen, (lower)alkoxycarbonyl, etc.;
R
3
is hydroxy(lower)alkyl; halo(lower)alkyl, etc.;
R
4
is aryl or unsaturated heterocyclic group, each of which may have one or two substituent(s) selected from the group consisting of lower alkyl, hydroxy, carbamoyl, halogen, lower alkoxy, etc.; and a salt thereof which is useful as a medicament.