Patents by Inventor Sun-Ki Chang

Sun-Ki Chang 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).

  • METHOD FOR PREPARING DIPEPTIDYL PEPTIDASE-IV INHIBITOR AND INTERMEDIATE
    Publication number: 20120016125
    Abstract: The present invention relates to an improved method for preparing dipeptidyl peptidase-IV inhibitor and intermediate. The present invention is able to reduce preparation costs by using low cost reagents on reaction and is able to be used in mass production by improving yield.
    Type: Application
    Filed: March 30, 2010
    Publication date: January 19, 2012
    Applicant: DONG-A PHARMACEUTICAL. CO., LTD
    Inventors: Woo Young Kwak, Heung Jae Kim, Jong Pil Min, Tae Hyun Yoon, Moohi Yoo, Geun Gho Lim, Sun Ki Chang
  • New aziridine derivatives and their preparation methods
    Publication number: 20060167277
    Abstract: The present invention relates to new aziridine derivative that is represented by following general chemical formulae (la) or (lb), and to their preparation method. In the above mentioned chemical formulae, R2 and R3 can be same or different, and they are hydrogen, low-quality alkyl or cycloalkyl respectively; R4 can be selected among hydrogen, alkyl, aril, or amino protective group, and amino protective group is, for example, (PH)3C, FMOC (9-fluorenylmethyl oxycarbonyl), alkoxycarbonyl, ariloxycarbonyl, aralkyloxycarbonyl and R5CO, R5SO2 where R5 is alkyl or aril or aralkyl.
    Type: Application
    Filed: March 24, 2006
    Publication date: July 27, 2006
    Applicant: SAMCHULLY PHARM. CO., LTD.
    Inventors: Jae-Sung Kang, Sun-Ki Chang, Kyoung-Mee Seol, Min-Kyu Kim
  • Aziridine derivatives and their preparation methods
    Patent number: 7049447
    Abstract: The present invention relates to a new aziridine derivative that is represented herein by general chemical formulae (Ia) or (Ib), and to their preparation method. In the said chemical formulae, R2 and R3 can be the same or different, and they are hydrogen, low-quality alkyl or cycloalkyl respectively; R4 can be selected among hydrogen, alkyl, aryl, or amino protective group; and amino protective group is, for example, (Ph)3C, and FMOC(9-fluorenylmethyloxycarbonyl), alkoxycarbonyl, aryloxycarbonyl, aralkyloxycarbonyl and R5CO, R5SO2 where R5 is alkyl, aryl or aralkyl.
    Type: Grant
    Filed: April 19, 2002
    Date of Patent: May 23, 2006
    Assignee: Samchully Pharm. Co.,Ltd.
    Inventors: Jae-Sung Kang, Sun-Ki Chang, Kyoung-Mee Seol, Min-Kyu Kim
  • Aziridine derivatives and their preparation methods
    Publication number: 20040097480
    Abstract: The present invention relates to a new aziridine derivative that is represented herein by general chemical formulae (Ia) or (Ib), and to their preparation method. In the said chemical formulae, R2 and R3 can be the same or different, and they are hydrogen, low-quality alkyl or cycloalkyl respectively; R4 can be selected among hydrogen, alkyl, aryl, or amino protective group; and amino protective group is, for example, (Ph)3C, and FMOC(9-fluorenylmethyloxycarbonyl), alkoxycarbonyl, aryloxycarbonyl, aralkyloxycarbonyl and R5CO, R5SO2 where R5 is alkyl, aryl or aralkyl.
    Type: Application
    Filed: September 29, 2003
    Publication date: May 20, 2004
    Inventors: Jae-Sung Kang, Sun-Ki Chang, Kyoung-Mee Seol, Min-Kyu Kim