申请人:Boehringer Ingelheim Pharma KG
公开号:US06187956B1
公开(公告)日:2001-02-13
The present invention relates to an improved process for preparing L-phenylephrine hydrochloride 3 on an industrial scale by asymmetric hydrogenation as the key step and a special sequence of subsequent steps, using [Rh(COD)Cl]2 as catalyst and a chiral, two-pronged phosphine ligand such as (2R,4R)-4-(dicyclohexylphosphino)-2-(diphenylphosphino-methyl)-N-methyl-aminocarbonyl-pyrrolidine as the catalyst system.
本发明涉及一种改进的工业规模下制备L-苯肾上腺素盐酸盐的方法,其关键步骤为不对称氢化反应,并采用特殊的后续步骤顺序,使用Rh(COD)Cl2作为催化剂,以及手性的双叉膦配体,如(2R,4R)-4-(二环己基膦基)-2-(二苯基膦基甲基)-N-甲基氨基甲酰吡咯烷作为催化体系。