Efficient Asymmetric Hydrogenation of .ALPHA.-Amino Ketone Derivatives. A Highly Enantioselective Synthesis of Phenylephrine, Levamisole, Carnitine and Propranolol.
chiral -substituted CPM-rhodium complexes were found to be efficient catalysts for asymmetric hydrogeantion of 3′-benzyloxy-2-(-benzyl--methyl)aminoacetophenone hydrochloride. A practical asymmetric synthesis of ()-(−)-phenylephrine hydrochloride catalyzed by newly synthesized (2,4)-MCCPM-rhodium complex has been achieved.
New chiral phosphinopyrrolidine compounds and their use for asymetric synthesis of optically active compounds
申请人:Achiwa, Kazuo
公开号:EP0251164A2
公开(公告)日:1988-01-07
New chiral phosphinopyrrolidine compounds of the general formula:
or
wherein R1 is a hydrogen atom, -COR, -COOR, -CONHR or -SO2R where R is an alkyl or aryl group, R2 and R3 each represents independently an aryl group which may have a substituent or substituents, and RA and R5 each represents independently an aliphatic or cycloaliphatic hydrocarbyl group which may have a substituent or substituents, as well as the use of these compound as ligand for a metal complex catalyst for asymmetric synthesis or optically active compounds. The new chiral phosphinopyrrolidine compounds are useful ligands which attain both of high optical yield and high reaction efficiency in catalytic asymmetric reduction.
Efficient Asymmetric Hydrogenation of .ALPHA.-Amino Ketone Derivatives. A Highly Enantioselective Synthesis of Phenylephrine, Levamisole, Carnitine and Propranolol.
The complexes of pyrrolidine bisphosphine ligands (CPMs) with rhodium (I) were found to be efficient catalysts for asymmetric hydrogenation of α-amino ketone hydrochloride derivatives. Utilizing this methodology, we have developed efficient asymmetric syntheses of the optically active β-amino alcohols, phenylephrine, levamisole, carnitine and propranolol.