Patents by Inventor Jin K. Cha

Jin K. Cha 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).

  • Synthesis of (-)-swainsonine and intermediate compounds employed in such synthesis
    Patent number: 5484925
    Abstract: Enamides of the formula: ##STR1## wherein each R.sub.2 when taken independently represents alkoxymethyl or arylmethyl and when taken together represent alkylene bridging the oxygen atoms to which they are bonded; and R.sub.3 represents oxygen or hydrogen; are described as useful intermediates in a process for preparing swainsonine.
    Type: Grant
    Filed: April 29, 1993
    Date of Patent: January 16, 1996
    Inventors: Jin K. Cha, Richard B. Bennett, III
  • Hair color rinse composition containing haloginated fluorescein dyes
    Patent number: 5356438
    Abstract: A hair color rinse composition that simultaneously dyes and conditions hair which comprises a tinctorial amount of one or more acidic dyes, from about 0.01 to 0.5 parts by weight based on the total weight of the composition of one or more halogenated fluorescein dyes and from about 1.0 to 20.0 parts by weight based on the total weight of the composition of a disodium dimethicone copolyol sulfosuccinate is disclosed.
    Type: Grant
    Filed: January 7, 1993
    Date of Patent: October 18, 1994
    Assignee: Pacific Corporation
    Inventors: Chang K. Kim, Jin K. Cha, Eung S. Kang
  • Synthesis of (-)-swainsonine and intermediate compounds employed in such synthesis
    Patent number: 5288875
    Abstract: Imines of the formula: ##STR1## wherein R is alkyl and R.sub.2 is Ketal, alkoxymethyl or arylmethyl and enamides of the formula: ##STR2## wherein R.sub.2 is as defined above and R.sub.3 is oxygen or hydrogen are useful intermediates in a process for preparing swainsonine.
    Type: Grant
    Filed: August 24, 1992
    Date of Patent: February 22, 1994
    Inventors: Jin K. Cha, Richard B. Bennett, III
  • Synthesis of (-) swainsonine and intermediate compounds employed in such synthesis
    Patent number: 5187279
    Abstract: (-)-Swainsonine is prepared by the steps of first reacting a compound having the formula: ##STR1## wherein each R.sub.2 is lower alkyl, with (4-carbalkoxybutyl) triphenylphosphonium bromide in a strong base to obtain an alcohol having the formula: ##STR2## wherein R.sub.2 is as defined above and R is C.sub.1 -C.sub.8 alkyl; the alcohol is then reacted with methanesulfonyl chloride or p-toluenesulfonyl chloride or benzenesulfonyl chloride in the presence of a tertiary amine to obtain the corresponding sulfonate. Heating the sulfonate with an azide in an organic solvent yields an imine having the formula: ##STR3## wherein R.sub.2 and R are ad defined above. Treating the imine with an inorganic base, in aqueous alcohol provides upon acidification, the corresponding acid. Heating the acid at reflux temperature in organic solvent, yields an enamide having the formula: ##STR4## wherein R.sub.2 is as defined above.
    Type: Grant
    Filed: August 14, 1991
    Date of Patent: February 16, 1993
    Inventors: Jin K. Cha, Richard B. Bennett, III