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.
Mutual Kinetic Resolution of Racemic 3,4-Dihydro-3-methyl-2<i>H</i>
-[1,4]benzoxazines with Acyl Chlorides of Racemic <i>O</i>
-Phenyllactic Acids and DFT Modelling of Transition States
作者:Marina A. Korolyova、Sergey A. Vakarov、Dmitry N. Kozhevnikov、Dmitry A. Gruzdev、Galina L. Levit、Victor P. Krasnov
DOI:10.1002/ejoc.201800656
日期:2018.9.9
The acylative kinetic resolution of 3,4‐dihydro‐3‐methyl‐2H‐[1,4]benzoxazines with racemic 2‐aryloxypropionyl chlorides has been studied experimentally and the geometries of the diastereoisomeric transition states determined by DFT calculations. It has been found that quantum chemical calculations describe well the quantitative dependence of the acylation selectivity on the reagents' structures.