Patents Assigned to Dong Kook Pharmaceutical Company, Inc.
  • Process for preparing benzodiazepine derivatives
    Patent number: 5817808
    Abstract: The object of the present invention is to provide an improved process for preparing benzodiazepine-3-alkyl carboxylate of formula(I) and its pharmaceutically acceptable salts and esters. ##STR1## wherein R.sup.1 is methyl, ethyl or isopropyl;R.sup.2 and R.sup.3 are each independently hydrogen or C.sub.1 -C.sub.6 lower alkyl;R.sup.4 is hydrogen, halogen or trifluoromethyl;carbon atom denoted as c has the S-- or R, S-- configuration.
    Type: Grant
    Filed: September 8, 1997
    Date of Patent: October 6, 1998
    Assignee: Dong Kook Pharmaceutical Company, Inc.
    Inventors: Yong Hae Kim, Jin Kyu Park, Kwon Kim, Hee Sock Park