Patents by Inventor Tsung-tee Li

Tsung-tee Li 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).

  • Patent number: 4912235
    Abstract: This invention relates to a process for making a compound of formula I ##STR1## in the form of a stereoisomer or mixture thereof, wherein R is hydrogen, lower alkyl; X is hydrogen, halo, trifluoromethyl, lower alkyl or lower alkoxy, and the wavy lines represent the .alpha. or .beta. configuration with the proviso that when one wavy line is .alpha. the other is .beta., or a pharmaceutically acceptable, non-toxic salt of the compound wherein R is hydrogen; novel intermediates useful for preparing these compounds; processes for making the intermediates; and a stereoisomer of the compound of formula I wherein R is methyl and X is hydrogen and a process for making same.
    Type: Grant
    Filed: June 7, 1988
    Date of Patent: March 27, 1990
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Gary F. Cooper, Douglas L. Wren, Albert R. Van Horn, Tsung-Tee Li, Colin C. Beard
  • Patent number: 4804787
    Abstract: This invention relates to a process for making an enantiomer or racemic mixture of a compound of the formula ##STR1## wherein R is hydrogen, lower alkyl or a pharmaceutically acceptable, non-toxic salt of a compound wherein R is hydrogen; X is hydrogen, halo, trifluoromethyl, lower alkyl or lower alkoxy, and the wavy lines represent the .alpha. or .beta. configuration with the proviso that when one wavy line is .alpha. the other is .beta.; novel intermediates useful for preparing these compounds; and processes for making the intermediates.
    Type: Grant
    Filed: October 9, 1985
    Date of Patent: February 14, 1989
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Gary F. Cooper, Douglas L. Wren, Albert R. Van Horn, Tsung-Tee Li, Colin C. Beard
  • Patent number: 4780562
    Abstract: This invention relates to a process for making a compound of formula I ##STR1## in the form of a stereoisomer or mixture thereof, wherein R is hydrogen, lower alkyl; X is hydrogen, halo, trifluoromethyl, lower alkyl or lower alkoxy, and the wavy lines represent the .alpha. or .beta. configuration with the proviso that when one wavy line is .alpha. the other is .beta., or a pharmaceutically acceptable, non-toxic salt of the compound wherein R is hydrogen; novel intermediates useful for preparing these compounds; processes for making the intermediates; and a stereoisomer of the compound of formula I wherein R is methyl and X is hydrogen and a process for making same.
    Type: Grant
    Filed: September 13, 1985
    Date of Patent: October 25, 1988
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Gary F. Cooper, Douglas L. Wren, Albert R. Van Horn, Tsung-Tee Li, Colin C. Beard
  • Patent number: 4600785
    Abstract: This invention relates to a process for making an enantiomer or racemic mixture of a compound of the formula ##STR1## wherein R is hydrogen, lower alkyl or a pharmaceutically acceptable, non-toxic salt of a compound wherein R is hydrogen; X is hydrogen, halo, trifluoromethyl, lower alkyl or lower alkoxy, and the wavy lines represent the .alpha. or .beta. configuration with the proviso that when one wavy line is a .alpha. the other is .beta.; novel intermediates useful for preparing these compounds; and processes for making the intermediates.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: July 15, 1986
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Gary F. Cooper, Douglas L. Wren, Albert R. Van Horn, Tsung-Tee Li, Colin C. Beard
  • Patent number: 4552898
    Abstract: Compounds useful in treating cardiovascular disorders are the carboxylic acids depicted in formulas (1) and (2) ##STR1## as well as their pharmaceutically acceptable, non-toxic salts and esters, wherein:n is an integer from one to four;R.sub.1 is hydroxy;R.sub.2 is hydrogen; orR.sub.1 and R.sub.2 together are an oxo group;R.sub.3 is ##STR2## wherein A is --CH.sub.2 --CH.sub.2 --; trans--CH.dbd.CH--; --C.tbd.C--; andR.sub.4 is linear or branched alkyl of one to twelve carbons, preferably 1-10 carbons, most preferably 3-8 carbons, cycloalkyl of three to eight carbons; phenyl optionally substituted with one or two identical substituents selected from the group consisting of lower alkyl, lower alkoxy, hydroxy, trifluoromethyl, and halo; or phenylloweralkyl optionally substituted with one or two identical substituents selected from the group consisting of lower alkyl, lower alkoxy, hydroxy, trifluoromethyl, and halo.
    Type: Grant
    Filed: August 19, 1983
    Date of Patent: November 12, 1985
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Tsung-Tee Li, Michael Marx
  • Patent number: 4548949
    Abstract: A compound of the formula ##STR1## and the pharmaceutically acceptable acid addition salts thereof are potent antihypertensive agents and are therefore useful as cardiovascular system regulators. These compounds are also useful as bronchodilators.
    Type: Grant
    Filed: August 29, 1983
    Date of Patent: October 22, 1985
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Joseph M. Muchowski, Robert Greenhouse, Jack Ackrell, Tsung-Tee Li, Jurg R. Pfister
  • Patent number: 4543361
    Abstract: A compound of the formula ##STR1## and the pharmaceutically acceptable acid addition salts thereof are potent antihypertensive agents and are therefore useful as cardiovascular system regulators.
    Type: Grant
    Filed: August 29, 1983
    Date of Patent: September 24, 1985
    Inventors: Joseph M. Muchowski, Robert Greenhouse, Jack Ackrell, Tsung-Tee Li, Jurg R. Pfister
  • Patent number: 4423068
    Abstract: Compounds useful in treating cardiovascular disorders are the carboxylic acids depicted in formulas (1) and (2) ##STR1## as well as their pharmaceutically acceptable, non-toxic salts and esters, wherein:n is an integer from one to four;R.sub.1 is hydroxy;R.sub.2 is hydrogen; orR.sub.1 and R.sub.2 together are an oxo group;R.sub.3 is ##STR2## wherein A is --CH.sub.2 --CH.sub.2 --; trans-CH.dbd.CH--; --C.tbd.C--; andR.sub.4 is linear or branched alkyl of one to twelve carbons, cycloalkyl of three to eight carbons; phenyl optionally substituted with one or two identical substituents selected from the group consisting of lower alkyl, lower alkoxy, hydroxy, trifluoromethyl, and halo; or optionally substituted phenylalkyl.
    Type: Grant
    Filed: July 14, 1982
    Date of Patent: December 27, 1983
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Tsung-tee Li, Michael Marx
  • Patent number: 4065452
    Abstract: Novel, topically-active anti-inflammatory steroids are represented by the formula ##STR1## wherein X is fluoro, chloro or hydrogen; X.sup.1 is fluoro, chloro, bromo, or hydrogen; X.sup.2 is hydroxy or may be chloro when X.sup.1 is chloro; and X.sup.3 and X.sup.4 are independently fluoro, chloro or bromo. These steroids are prepared by formylating at the 21-position a 16.alpha.,17.beta.-isopropylidenedioxypregna-1,4,9(11)-triene-3,20-dione or the corresponding 21-fluoro compound, halogenating at the 21 position, deformylating, then reacting to add the desired components at the 9.alpha. and 11.beta. positions.
    Type: Grant
    Filed: August 2, 1976
    Date of Patent: December 27, 1977
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Tsung-tee Li, Michael Marx, Lewis J. Throop