Preparation of enantiopure 4-arylmandelic acids via a Pd/C catalysed Suzuki coupling of enantiopure 4-bromomandelic acid
摘要:
A library of enantiomerically pure mandelic acid derivatives has been prepared using a palladium on carbon catalysed Suzuki reaction. The chirality was derived from enantiomerically pure 4-bromomandelic acid which was obtained by resolution with alpha -methylbenzylamine. (C) 2001 Elsevier Science Ltd. All rights reserved.
Solid Phase Behavior in the Chiral Systems of Various 2-Hydroxy-2-phenylacetic Acid (Mandelic Acid) Derivatives
摘要:
The solid phase behavior of a series of monosubstituted F-, Cl-, Br-, I-, and CH3- and two 2,4-halogen-disubstituted 2-hydroxy-2-phenylacetic acid (mandelic acid) derivatives was investigated. The study includes detailed information about melting temperature, melting enthalpy, Xray diffraction data, as well as selected binary phase diagrams of the respective chiral systems. Aside from the known metastable metastable conglomerates was found.
Enantioseparation of chiral mandelic acid derivatives by supercritical fluid chromatography
作者:Jiawei Ding、Ming Zhang、Huixue Dai、Chunmian Lin
DOI:10.1002/chir.23018
日期:2018.12
Mandelicacid and its derivatives are important chiral analogs which are widely used in the pharmaceutical synthetic industry. The present study investigated the enantiomeric separation of six mandelicacids (mandelicacid, 2‐chloromandelic acid, 3‐chloromandelic acid, 4‐chloromandelic acid, 4‐bromomandelic acid, 4‐methoxymandelic acid) on the Chiralpak AD‐3 column by supercritical fluid chromatography
The Synthesis of Chiral α-Aryl α-Hydroxy Carboxylic Acids via RuPHOX-Ru Catalyzed Asymmetric Hydrogenation
作者:Huan Guo、Jing Li、Delong Liu、Wanbin Zhang
DOI:10.1002/adsc.201700846
日期:2017.10.25
A ruthenocenyl phosphino‐oxazoline‐ruthenium complex (RuPHOX−Ru) catalyzedasymmetrichydrogenation of α‐aryl keto acids has been successfully developed, affording the corresponding chiral α‐aryl α‐hydroxy carboxylic acids in high yields and with up to 97% ee. The reaction could be performed on a gram scale with a relatively low catalyst loading (up to 5000 S/C) and the resulting products can be transformed
已成功开发了钌烯基膦基-恶唑啉-钌络合物(RuPHOX-Ru)催化的α-芳基酮酸不对称氢化反应,可提供高收率和ee高达97%的相应手性α-芳基α-羟基羧酸。该反应可以在相对较低的催化剂负载量(至多5000 S / C)下以克为单位进行,所得产物可以转化为几种手性结构单元,生物活性化合物和手性药物。
[EN] ACID ADDITION SALTS OF PIPERAZINE DERIVATIVES<br/>[FR] SELS D'ADDITION D'ACIDE DE DÉRIVÉS DE PIPÉRAZINE
申请人:ASCENEURON S A
公开号:WO2017144637A1
公开(公告)日:2017-08-31
The invention relates to acid addition salts of piperazine derivatives, as well as solid forms, such as polymorphic forms, thereof, which are useful as pharmaceutical ingredients and in particular as glycosidase inhibitors.
[EN] PROCESS FOR THE SEPARATION OF ENANTIOMERS OF PIPERAZINE DERIVATIVES<br/>[FR] PROCÉDÉ DE SÉPARATION D'ÉNANTIOMÈRES DE DÉRIVÉS DE PIPÉRAZINE
申请人:ASCENEURON S A
公开号:WO2017144635A1
公开(公告)日:2017-08-31
The invention relates to a process for preparing either enantiomer of a compound of formula (I), wherein X, Y and n have the meaning given in claim 1, with high enantiomeric excess (e.e.), by chiral resolution in the presence of a non-racemic, chiral acid.
Nitrilases, Nucleic Acids Encoding Them and Methods for Making and Using Them
申请人:DeSantis Grace
公开号:US20100009426A1
公开(公告)日:2010-01-14
The invention relates to nitrilases and to nucleic acids encoding the nitrilases. In addition methods of designing new nitrilases and method of use thereof are also provided. The nitrilases have increased activity and stability at increased pH and temperature.