Patents by Inventor Imtiaz Ahm Ansari

Imtiaz Ahm Ansari 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).

  • Method for producing (+) (2S,3S)-3-(2-aminophenylthio)-2-hydroxy-3(4'-methoxyphenyl)-propionic acid
    Patent number: 6130352
    Abstract: A process for the preparation of (+) (2S, 3S)-3-(2-aminophenylthio)-2-hydroxy-3-(4'-methoxyphenyl)-propionic acid which comprises treating the (.+-.) compound of (2RS, 3RS) 3-(2-aminophenylthio)-2-hydroxy-3-(4'-methoxyphenyl)-propionic acid (formula (II)) with the (+) compound of the 2-methylbenzylamine (formula (III)) and an alkali in the presence of a polar solvent, the amount of the compound of the formula (III) and the alkali being in half equivalent amount of compound of the formula (II) employed, separating the precipitate (+) amine salt form of (2-aminophenylthio)-2-hydroxy-3-(4'-methoxyphenyl)-propionic acid from the 1(-) salt form remaining in solution, by known methods treating the (+) amine salt from with an organic solvent and then decomposing the (+) amine salt form to produce (+)(2s, 3s)-3-(2-aminophenylthio)-2-hydroxy-3-(4'-methoxyphenyl)-propionic acid.
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: October 10, 2000
    Assignee: Council of Scientific & Industrial Research
    Inventors: Yennu Sangiah Sadanandam, Meera Manjaya Shetty, Imtiaz Ahm Ansari, Jhillu Singh Yadav, Alla Venkata Rama Rao