Catalytic Diamino‐Sugar‐Assisted Enantioselective Hydrogenation

Carbohydrate ligands have been studied in transition‐metal‐catalyzed hydrogenations in recent decades. Herein, we report the diastereoselective synthesis of trans ‐dichlorido(bisphosphane)ruthenium(II) complexes with four different methyl 2,3‐diamino‐4,6‐ O ‐benzylidene‐2,3‐dideoxy‐α‐ D ‐hexopyranosides and their application as catalyst precursors in asymmetric hydrogenation reactions. Depending on the hexopyranose, an enantiomeric excess of up to 78 % was obtained.