Patents Assigned to Zhejiang Hushai Pharmaceuticals Co., Ltd.
  • Method for resolution of citalopram intermediate 5-cyano diol
    Patent number: 10287240
    Abstract: Provided is a method for resolution of formula 4-[4-dimethylamino-1-(4-fluorophenyl)-1-hydroxylbutyl]-3-hydroxy-methyl benzonitrile as an enantiomer thereof, comprising the following steps: a salt of (S)-4-[4-dimethylamino-1-(4-fluorophenyl)-1-hydroxylbutyl]-3-hydroxymethyl benzonitrile with a resolving agent D-(+)di-p-toluoyl tartaric acid was crystallized in a resolving solvent; the method is characterized in that the resolving solvent is an ether solvent. Also provided is a new crystal form of the resolved intermediate.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: May 14, 2019
    Assignee: Zhejiang Hushai Pharmaceuticals Co., Ltd.
    Inventors: Zunjun Liang, Siqi Hu, Caihua Peng, Wenfeng Huang, Qifeng Lu, Guoliang Tu