[EN] METHOD OF OBTAINING CLOPIDOGREL<br/>[FR] PROCEDE DE FABRICATION DE CLOPIDOGREL
申请人:ZENTIVA AS
公开号:WO2006042481A1
公开(公告)日:2006-04-27
Separation of the camphorsulfonic salts of the compounds of formula (I) and (II) by one or more crystallizations from a mixture of two solvents, both R(-)-10-camphorsulfonic acid and its salts with the compounds of formula (I) and (II) being well soluble in at least one of the components, the formula of which can be indicated as RaOH, wherein Ra is a straight or branched C1 to C5 alkyl. In the other components, camphorsulfonic acid and its salts are less soluble; however, they dissolve compounds of formula (I) and (II) very well.
Unbalanced-Ion-Pair-Catalyzed Nucleophilic Fluorination Using Potassium Fluoride
作者:Wangbing Li、Zhichao Lu、Gerald B. Hammond、Bo Xu
DOI:10.1021/acs.orglett.1c03887
日期:2021.12.17
An unbalanced ion pair promoter (e.g., tetrabutylammonium sulfate), consisting of a bulky and charge-delocalized cation and a small and charge-localized anion, greatly accelerates nucleophilic fluorinations using easy handling KF. We also successfully converted an inexpensive and commercially available ion-exchange resin to the polymer-supported ion pair promoter (A26–SO42–), which could be reused
Asymmetric Hydrogenation of α-Amino Esters into Optically Active β-Amino Alcohols through Dynamic Kinetic Resolution Catalyzed by Ruthenabicyclic Complexes
Racemic α-substituted α-amino esters were hydrogenated into enantioenriched β-amino alcohols throughdynamickineticresolution with chiral ruthenabicyclic complexes. The reaction was carried out with a substrate/catalyst molar ratio of 200–1000 under 15 atm of H2 at 25 °C to afford a variety of β-substituted β-aminoethanols in up to 96% ee (24 examples). The mechanistic studies including deuteration