Patents by Inventor Leon De Brabander, Jr.

Leon De Brabander, Jr. 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).

  • Disubstituted polycyclic systems and preparative methods therefor
    Patent number: 5424430
    Abstract: Polycyclic cognition enhancers having the general formula (1a), (1b) or (1c) are provided: ##STR1## wherein: R.sub.1 is a heterocyclic aromatic moiety such as a 4-pyridyl, 2-pyridyl, 4-pyrimidyl, or pyrazinyl group;R.sub.2 and R.sub.3 are independently H, F, Cl, Br, NO.sub.2, CONH.sub.2, CON(R.sub.4)(R.sub.4 '), S(O).sub.m R.sub.4, CF.sub.3, or N(R.sub.4)(R.sub.4 ');R.sub.4 and R.sub.4 ' are independently H, alkyl having from 1 to 4 carbon atoms, CH.sub.2 Phe--W, or Phe--W;Phe is a phenyl group;R.sub.5 is --(CH.sub.2).sub.n --Y or --OCOR.sub.4 ;Y is H, OH, NH.sub.2, NHR.sub.4, N(R.sub.4)(R.sub.4 '), NHCOR.sub.4, NHCO.sub.2 R.sub.4, NHS(O).sub.2 R.sub.4, F, Cl, Br, OR.sub.4, S(O).sub.m R.sub.4, CO.sub.2 H, CO.sub.2 R.sub.4, CN, CON(R.sub.4)(R.sub.4 '), CONHR.sub.4, CONH.sub.2, COR.sub.4, Phe, Phe--W, --C.tbd.CCO.sub.2 R.sub.4, --CH.dbd.CHR.sub.4, --C.tbd.CR.sub.4, or a heterocyclic aromatic moiety such as a 4-pyridyl, 2-pyridyl, 4-pyrimidyl, or pyrazinyl group;W is F, Cl, Br, R.sub.4, OR.sub.4, NO.sub.2, NH.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: June 13, 1995
    Assignee: The Du Pont Merck Pharmaceutical Company
    Inventors: James H. Jensen, Timothy D. Costello, Leon De Brabander, Jr., Matthew E. Voss
  • Disubstituted polycyclic systems and preparative methods therefor
    Patent number: 5272269
    Abstract: Polycyclic cognition enhancers having the general formula (1a), (1b) or (1c) are provided: ##STR1## wherein: R.sub.1 is a heterocyclic aromatic moiety such as a 4-pyridyl, 2-pyridyl, 4-pyrimidyl, or pyrazinyl group;R.sub.2 and R.sub.3 are independently H, F, Cl, Br, NO.sub.2, CONH.sub.2, CON(R.sub.4)(R.sub.4 '), S(O).sub.m R.sub.4, CF.sub.3, or N(R.sub.4)(R.sub.4 ');R.sub.4 and R.sub.4 ' are independently H, alkyl having from 1 to 4 carbon atoms, CH.sub.2 Phe--W, or Phe--W;Phe is a phenyl group;R.sub.5 is --(CH.sub.2).sub.n --Y or --OCOR.sub.4 ;Y is H, OH, NH.sub.2, NHR.sub.4, N(R.sub.4)(R.sub.4 '), NHCOR.sub.4, NHCO.sub.2 R.sub.4, NHS(O).sub.2 R.sub.4, F, Cl, Br, OR.sub.4, S(O).sub.m R.sub.4, CO.sub.2 H, CO.sub.2 R.sub.4, CN, CON(R.sub.4)(R.sub.4 '), CONHR.sub.4, CONH.sub.2, COR.sub.4, Phe, Phe--W, --C.tbd.CCO.sub.2 R.sub.4, --CH.dbd.CHR.sub.4, --C.tbd.CR.sub.4, or a heterocyclic aromatic moiety such as a 4-pyridyl, 2-pyridyl, 4-pyrimidyl, or pyrazinyl group;W is F, Cl, Br, R.sub.4, OR.sub.4, NO.sub.2, NH.
    Type: Grant
    Filed: January 16, 1992
    Date of Patent: December 21, 1993
    Assignee: The Du Pont Merck Pharmaceutical Company
    Inventors: James H. Jensen, Timothy D. Costello, Leon De Brabander, Jr., Matthew E. Voss