Patents by Inventor Kyung-Ik Lee

Kyung-Ik Lee 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 amlodipine
    Publication number: 20020132834
    Abstract: Amlodipine is prepared in a high yield by subjecting a pyrrole derivative, methyl aminocrotonate and 2-chlorobenzaldehyde to a Hantzsch reaction, and converting the pyrrole residue of the resulting 1,4-dihydropyridine derivative to an amine group by the action of hydroxylamine hydrochloride.
    Type: Application
    Filed: March 11, 2002
    Publication date: September 19, 2002
    Inventors: Young-Ho Moon, Nam-Du Kim, Kyung-Ik Lee, Kwan-Sun Lee
  • High-yield method for preparing lansoprazole
    Patent number: 6423846
    Abstract: Lansoprazole of formula (I) can be produced economically in a high yield using a simple, two-step method comprising reacting hydroxymethylpyridine and benzimidazole starting materials in the presence of a phosphine compound and a dialkyl azodicaboxlate and oxidizing the product of the first step in the presence of an organic radical catalyst:
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: July 23, 2002
    Assignee: Hanmi Pharm. Co., Ltd.
    Inventors: Young-Ho Moon, Kyung-Ik Lee, Gwan-Sun Lee