Patents Assigned to Yukong, Ltd.
  • Convenient process for the preparation of chiral or racemic phenylalaninols and their N-blocked derivatives
    Patent number: 5367094
    Abstract: This invention pertains to an improved process for preparing chiral or racemic phenylalaninol (PAO) by hydrogenation of L(+)- or racemic 2-amino-1-phenyl-1,3-propanediol (APPD) in the presence of a strong volatile acid. Furthermore, a more valuable form of PAO such like N-blocked PAO was found to be directly produceable from the hydrogenation mixture without isolation of PAO, when a volatile acid was used as the medium of the hydrogenation reaction.
    Type: Grant
    Filed: June 4, 1993
    Date of Patent: November 22, 1994
    Assignee: Yukong, Ltd.
    Inventor: Dae-won Chung