Patents Represented by Attorney, Agent or Law Firm Cooper + Dunham LLP
  • Method for preparing camptothecin derivatives
    Patent number: 6716982
    Abstract: The present invention relates to a process for preparing camptothecin and camptothecin analogs of Formula (I) from compounds of Formula (II) and to novel intermediates useful in their preparation, wherein R1 to R6 represent various substituents.
    Type: Grant
    Filed: July 11, 2001
    Date of Patent: April 6, 2004
    Assignee: OSI Pharmaceuticals, Inc.
    Inventors: Francis Gerard Fang, Shiping Xie