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.
New chiral oxazaphospholidine oxides as highly efficient catalysts in the enantioselective reduction of ketones
作者:Viola Peper、Jürgen Martens
DOI:10.1016/0040-4039(96)01928-4
日期:1996.11
New catalysts 4–10 for the asymmetric reduction of the two model ketones 13 and 14 by borane are described. These catalysts are easily prepared by reaction of the corresponding β-amino alcohols with phenylphosphonic dichloride or alternatively by oxidation of the chiral 1,3,2-oxazaphospholidines. Enantiomeric excesses of 96% in the case of the ω-chloroacetophenone have been obtained using only 1 mol%
Diastereoselective Synthesis of Vinylmorpholines by Palladium-Catalyzed Tandem Allylic Substitutions using Enantiopure Aminoalcohols as Bifunctional Nucleophiles
作者:C Thorey
DOI:10.1016/00404-0399(50)1061l-
日期:1995.7.31
Stingl, Klaus; Martens, Juergen, Liebigs Annalen der Chemie, 1994, # 5, p. 479 - 484
作者:Stingl, Klaus、Martens, Juergen
DOI:——
日期:——
Stingl, Klaus; Martens, Juergen, Liebigs Annalen der Chemie, 1994, # 5, p. 485 - 490