Patents by Inventor James L. Leighton

James L. Leighton 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: 7534905
    Abstract: A new class of reagents and method of use of the reagents in the reaction of the reagents with electrophilic compounds. The invention in one embodiment is directed to a method for the formation of an alcohol of the formula (I). The method includes reacting a reagent of the formula (II) with an aldehyde of the formula R10CHO to form the alcohol. X3 is one of O and C(R4)(R5). Each of X1 and X2 is independently O or N—R. Each of Ca and Cb is independently an achiral center, an (S) chiral center or an (R) chiral center. Ra and Rb are (i) each independently C1-10 alkyl, C6-10 aryl or C3-9 heteroaryl, or (ii) taken together to form a C3—C4 alkylene chain which together with Ca and Cb forms a 5-membered or 6-membered aliphatic ring. Rc and Rd are each independently hydrogen, C1-10 alkyl, C6-10 aryl or C3-9 heteroaryl. R is C1-10 alkyl, C6-10 aryl or C3-9 heteroaryl.
    Type: Grant
    Filed: March 3, 2003
    Date of Patent: May 19, 2009
    Assignee: The Trustees of Columbia University In the City of New York
    Inventors: James L. Leighton, Xiaolun Wang, James Kinnaird
  • Patent number: 6057458
    Abstract: The present invention provides a process for producing an optically active aldehyde which comprises hydroformylating a terminal olefin substrate represented by the formula:Q.sub.1 Q.sub.2 C.dbd.CH.sub.2wherein Q.sub.1 is an atom or group other than carbon or hydrogen and Q.sub.2 is an atom or group other than hydrogen, in the presence of CO, H.sub.2 and a catalyst, which catalyst comprises a transition metal based compound and a ligand.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: May 2, 2000
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: James L. Leighton, Deidre N. O'Neil
  • Patent number: 5929232
    Abstract: The present invention relates to a process for stereoselective or regioselective chemical synthesis which generally comprises reacting a nucleophile and a chiral or prochiral cyclic substrate in the presence of a non-racemic chiral catalyst to produce a stereoisomerically or regioselectively enriched product.
    Type: Grant
    Filed: March 25, 1996
    Date of Patent: July 27, 1999
    Assignee: President and Fellows of Harvard College
    Inventors: Eric N. Jacobsen, James L. Leighton, Luis E. Martinez
  • Patent number: 5665890
    Abstract: The present invention relates a process for stereoselective or regioselective chemical synthesis which generally comprises reacting a nucleophile and a chiral or prochiral cyclic substrate in the presence of a non-racemic chiral catalyst to produce a steroisomerically or regioselectively enriched product.
    Type: Grant
    Filed: March 14, 1995
    Date of Patent: September 9, 1997
    Assignee: President and Fellows of Harvard College
    Inventors: Eric N. Jacobsen, James L. Leighton, Luis E. Martinez