Asymmetric Hydrogenation of 2,4‐Disubstituted 1,5‐Benzodiazepines Using Cationic Ruthenium Diamine Catalysts: An Unusual Achiral Counteranion Induced Reversal of Enantioselectivity

Abstract

BArFing it out the other way: A highly enantioselective hydrogenation of 2,4-disubstituted 1,5-benzodiazepines using chiral cationic ruthenium diamine catalysts (R,R)-1 has been developed (see scheme; BArF=tetrakis(3,5-bistrifluoromethylphenyl)borate). Either enantiomer of 2,4-diaryl-2,3,4,5-tetrahydro-1H-benzodiazepine derivatives could be obtained by using the same enantiomer of ligand but in the presence of a different achiral counteranion. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.