Patents by Inventor Chunyan Dan

Chunyan Dan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Morphinan derivatives and preparation methods thereof
    Patent number: 8563721
    Abstract: The present invention relates to morphinan derivatives and preparation methods thereof, especially to ketal hydroxyl protected compounds of morphinan derivatives and preparation method thereof, and to a method for preparing corresponding alkylated morphinan derivatives by using the ketal hydroxyl protected compounds as intermediates, and more especially to a ketal hydroxyl protected compound of methylnaltrexone as intermediate for preparing methylnaltrexone and a method for preparing methylnaltrexone through said intermediate.
    Type: Grant
    Filed: June 19, 2009
    Date of Patent: October 22, 2013
    Assignee: Chongqing Pharmaceutical Research Institute Co., Ltd.
    Inventors: Huafu Sun, Jie Luo, Wenrun Ye, Jie Deng, Bo Lin, Chunyan Dan, Bin Fan
  • MORPHINAN DERIVATIVES AND PREPARATION METHODS THEREOF
    Publication number: 20110112297
    Abstract: The present invention relates to morphinan derivatives and preparation methods thereof, especially to ketal hydroxyl protected compounds of morphinan derivatives and preparation method thereof, and to a method for preparing corresponding alkylated morphinan derivatives by using the ketal hydroxyl protected compounds as intermediates, and more especially to a ketal hydroxyl protected compound of methylnaltrexone as intermediate for preparing methylnaltrexone and a method for preparing methylnaltrexone through said intermediate.
    Type: Application
    Filed: June 19, 2009
    Publication date: May 12, 2011
    Applicant: Chongqing Pharmaceutical Research Institute Co., Ltd.
    Inventors: Huafu Sun, Jie Luo, Wenrun Ye, Jie Deng, Bo Lin, Chunyan Dan, Bin Fan