Microbial Deracemization of α-Substituted Carboxylic Acids: Substrate Specificity and Mechanistic Investigation
作者:Dai-ichiro Kato、Satoshi Mitsuda、Hiromichi Ohta
DOI:10.1021/jo034253x
日期:2003.9.1
A new enzymatic method for the preparation of opticallyactive alpha-substituted carboxylic acids is reported. This technique is called deracemization reaction, which provides us with a route to obtain the enantiomerically pure compounds, theoretically in 100% yield starting from the racemic mixture. This means that the synthesis of a racemate is almost equal to the synthesis of the optically active
Nonenzymatic Dynamic Kinetic Resolution of α-(Arylthio)- and α-(Alkylthio)alkanoic Acids
作者:Xing Yang、Vladimir B. Birman
DOI:10.1002/anie.201007860
日期:2011.6.6
Dynamic solution: The title acids undergo dynamickineticresolution during an enantioselective esterification catalyzed by (S)‐homobenzotetramisole ((S)‐HBTM; see scheme). This method extends the scope of the carboxylic acid derivatives that are amenable to the nonenzymatic version of this transformation.
Kinetic Resolution of α-Substituted Alkanoic Acids Promoted by Homobenzotetramisole
作者:Xing Yang、Vladimir B. Birman
DOI:10.1002/chem.201101028
日期:2011.9.26
classes of substrates, namely, α‐aryl‐, α‐aryloxy/alkoxy‐, α‐halo‐, α‐azido‐, and α‐phthalimido‐alkanoicacids. Under similar conditions, α‐(arylthio/alkylthio)‐alkanoicacids undergo dynamickineticresolution providing corresponding esters in up to 92 % ee and up to 93 % yield.
Homobenzotetramisole-Catalyzed Kinetic Resolution of α-Aryl-, α-Aryloxy-, and α-Arylthioalkanoic Acids
作者:Xing Yang、Vladimir B. Birman
DOI:10.1002/adsc.200900451
日期:2009.10
Effective kineticresolution of alpha-aryl-, alpha-aryloxy-, and alpha-arylthioalkanoic acids has been achieved via in situ generation of their symmetrical anhydrides and enantioselective alcoholysis in the presence of homobenzotetramisole (HBTM) 3.
HPLC separation of 2-aryloxycarboxylic acid enantiomers on chiral stationary phases
作者:A. A. Tumashov、S. A. Vakarov、L. Sh. Sadretdinova、E. N. Chulakov、G. L. Levit、V. P. Krasnov、V. N. Charushin
DOI:10.1007/s11172-021-3165-8
日期:2021.5
reversed-phase HPLC on popular chiralstationaryphases. The best separation parameters were achieved on the chiralphases with the polysaccharide base Chiralcel OD-H and Chiralpack AD under the normal-phase HPLC conditions. The (S)- and (R)-enantiomers of 2-(1-naphthyloxy)- and 2-(2-iodophenoxy)propionic acids with enantiomeric excess ee >99% were isolated using preparative chiralHPLC.