Patents Assigned to Chungwha Chemical Synthesis & Biotech Co., Ltd.
  • Process for producing diamine derivative
    Patent number: 9809546
    Abstract: The present invention provides a low-toxic and high-recovery industrial process for synthesizing an optically active diamine derivative represented by formula (D), the process comprising the steps of: (a) mixing a compound represented by formula (A) and a compound represented by formula (C) in organic solvents and secondary amine; (b) reaction under heating; (c) cooling and adding water to the mixed solution, allowing it to crystallize to obtain the compound represented by formula (D).
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: November 7, 2017
    Assignee: Chungwha Chemical Synthesis & Biotech Co., Ltd.
    Inventors: Tzu-Chiang Lu, Chien-Yi Chen, Ching-Shuen Cheng, Chin-Cheng Mai