Optically active diphosphine compound, production intermediate thereof, transition metal complex containing the compound as ligand and asymmetric hydrogenation catalyst containing the complex
AssigneeTakasago International Corporation
InventorsTohru Yokozawa, Noboru Sayo, Takao Saito, Takero Ishizaki
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Abstract
This invention provides a novel diphosphine compound which is useful as a ligand of catalysts for asymmetric synthesis reactions, particularly asymmetric hydrogenation reaction. Particularly, it provides a diphosphine compound represented by a general formula (1): wherein R1 and R2 each independently represents a cycloalkyl group, an unsubstituted or substituted phenyl group or a five-membered aromatic heterocycle residue.
Claims7
A diphosphine compound represented by a formula (1):
- wherein R1 and R2 each independently represents a cycloalkyl group, an unsubstituted or substituted phenyl group or a five-membered aromatic heterocyclic group.
A diphosphine oxide compound represented by a formula (2):
- wherein R1 and R2 each independently represents a cycloalkyl group, an unsubstituted or substituted phenyl group or a five-membered aromatic heterocyclic group.
A diphosphine oxide compound represented by a formula (3):
- wherein R3 and R4 each independently represents a cycloalkyl group, an unsubstituted or substituted phenyl group, a five-membered aromatic heterocyclic group, a lower alkoxyl group, phenoxy group, benzyloxy group, chlorine atom or bromine atom.
Dependencies are inferred from the claim text.