Enantioselective hydrogenation using a rigid bicyclic aminophosphine phosphinite ligand
摘要:
Crystalline and in situ formed Rh-complexes from (1R,3R,5R)-O,N-bis-(diphenylphosphino)-3 -hydroxymethyl-2-azabicyclo-[3.3.0.]-octane and from the all (S)-enantiomer have been prepared and used in model assymmetric hydrogenations. The catalysts are highly active but the rigidity of their backbone does not contribute to an enhanced stereoselectivity. The ligand is readily available from an intermediate of the Ramipril synthesis the latter being a ACE inhibitor.
Crystalline and in situ formed Rh-complexes from (1R,3R,5R)-O,N-bis-(diphenylphosphino)-3 -hydroxymethyl-2-azabicyclo-[3.3.0.]-octane and from the all (S)-enantiomer have been prepared and used in model assymmetric hydrogenations. The catalysts are highly active but the rigidity of their backbone does not contribute to an enhanced stereoselectivity. The ligand is readily available from an intermediate of the Ramipril synthesis the latter being a ACE inhibitor.
Martens, Juergen; Luebben, Stefan, Liebigs Annalen der Chemie, 1990, # 9, p. 949 - 952