Patents by Inventor Mridula D. Choudhuri

Mridula D. Choudhuri 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).

  • Psoralens aminomethylation
    Patent number: 4950770
    Abstract: A direct, acid-catalyzed substitution reaction incorporates an N-phthalimidomethyl group on the 4' or 5' carbon of a psoralen in yields of 60-80% via the condensation of an N-hydroxymethylamide or phthalimide (e.g. N-hydroxymethylphthalimide) and an appropriately substituted psoralen. The phthalimide moiety is cleaved from the psoralen ring by treatment with hydrazine to give 60 to 70% yields of the aminomethylpsoralens.
    Type: Grant
    Filed: July 14, 1988
    Date of Patent: August 21, 1990
    Assignee: Elder Pharmaceuticals, Inc.
    Inventors: Ned D. Heindel, Mridula D. Choudhuri