Patents by Inventor Norman H. Dyson

Norman H. Dyson 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: 5274108
    Abstract: This invention provides an improved process for the preparation of compounds of formula (I): ##STR1## wherein: n is 0, 1 or 2;each R.sup.1 is independently halo or lower alkyl;R.sup.2 is nitro or --N(R.sup.3)R.sup.4 whereR.sup.3 is hydrogen or lower alkyl;R.sup.4 is hydrogen, lower alkyl, lower alkylsulfonyl or --C(Y)R.sup.5 where Y is oxygen or sulfur and R.sup.5 is hydrogen, lower alkyl, lower alkoxy or --N(R.sup.6)R.sup.7 where R.sup.6 is hydrogen or lower alkyl and R.sup.7 is hydrogen, lower alkyl or lower alkoxycarbonyl; orR.sup.3 and R.sup.4 together with N is pyrrolidino, piperidino, morpholino, thiomorpholino or piperazino, wherein the piperazino is optionally substituted at the 4-position by --C(O)R.sup.8 where R.sup.8 is hydrogen, lower alkyl, lower alkoxy or amino;or pharmaceutically acceptable salts thereof. These compounds are useful in treating disease-states characterized by hypercholesterolemia.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: December 28, 1993
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Norman H. Dyson, John O. Gardner, Anthony Prince, Denis J. Kertesz
  • Patent number: 5231181
    Abstract: The invention provides a process for preparing single enantiomers of compounds represented by the formula: ##STR1## and chiral acid addition salts thereof; wherein: X and Y are independently hydrogen; lower alkyl; lower alkoxy; or halo; or X and Y taken together is methylenedioxy or ethylene-1,2-dioxy;which includes reduction of a compound represented by the formula: ##STR2## to give a mixture of stereoisomers represented by the formula: ##STR3## wherein each wavy line independently represents a bond in either the .alpha. or .beta. position;followed by dissolving the mixture of stereoisomers and a chiral resolving acid in a suitable solvent and allowing the solution to crystallize, giving a salt of the desired enantiomer.
    Type: Grant
    Filed: March 21, 1991
    Date of Patent: July 27, 1993
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Norman H. Dyson, John O. Gardner, John C. Rohloff
  • Patent number: 5208331
    Abstract: This invention provides an improved process for the preparation of compounds of formula (I): ##STR1## wherein: n is 0, 1 or 2;each R.sup.1 is independently halo or lower alkyl;R.sup.2 is nitro or --N(R.sup.3)R.sup.4 whereR.sup.3 is hydrogen or lower alkyl;R.sup.4 is hydrogen, lower alkyl, lower alkylsulfonyl or --C(Y)R.sup.5 where Y is oxygen or sulfur and R.sup.5 is hydrogen, lower alkyl, lower alkoxy or --N(R.sup.6)R.sup.7 where R.sup.6 is hydrogen or lower alkyl and R.sup.7 is hydrogen, lower alkyl or lower alkoxycarbonyl; orR.sup.3 and R.sup.4 together with N is pyrrolidino, piperidino, morpholino, thiomorpholino or piperazino, wherein the piperazino is optionally substituted at the 4-position by --C(O)R.sup.8 where R.sup.8 is hydrogen, lower alkyl, lower alkoxy or amino;or pharmaceutically acceptable salts thereof. These compounds are useful in treating disease-states characterized by hypercholesterolemia.
    Type: Grant
    Filed: June 18, 1992
    Date of Patent: May 4, 1993
    Assignee: Syntex (U.S.A.) Inc.
    Inventors: Norman H. Dyson, John O. Gardner, Anthony Prince, Denis J. Kertesz