Patents by Inventor Changdev Namdev Raut

Changdev Namdev Raut 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).

  • Process for the preparation of 4,4-dimethyl-6-ethynylthiochroman
    Patent number: 7414143
    Abstract: An improved process for the preparation of key intermediates for tazarotene, 4,4-dimethyl-6-ethynylthiochroman, is provided comprising (a) reacting 4,4-dimethyl-6-acetylthiochroman of the formula with an acid chloride and an amido-group containing compound of the general formula wherein R is hydrogen or a hydrocarbyl of from 1 to 15 carbon atoms and R1 and R2 can be the same or different and are hydrocarbyls of from 1 to 15 carbon atoms or R1 and R2 together with the nitrogen atom to which they are bonded are joined together to form a heterocyclic group, optionally containing one or more additional heterocyclic atoms, or one of R1 and R2 together with the nitrogen atom to which it bonded are joined together with the carbonyl radical to form a heterocyclic group, optionally containing one or more additional heterocyclic atoms to form a ?-chloro vinyl carbonyl compound intermediate of the general formula wherein R has the aforestated meanings; and (b) reacting the ?-chloro vinyl carbonyl compound
    Type: Grant
    Filed: June 22, 2005
    Date of Patent: August 19, 2008
    Assignee: Glenmark Pharmaceuticals Limited
    Inventors: Bobba Venkata Siva Kumar, Vishvas Dattatraya Patil, Changdev Namdev Raut, Shekhar Bhaskar Bhirud, Batchu Chandrasekhar
  • Process for the preparation of 4,4-dimethyl-6-ethynylthiochroman
    Patent number: 6963002
    Abstract: An improved process for the preparation of key intermediates for tazarotene, 4,4-dimethyl-6-ethynylthiochroman, is provided comprising (a) reacting 4,4-dimethyl-6-acetylthiochroman of the formula with an acid chloride and an amido-group containing compound of the general formula wherein R is hydrogen or a hydrocarbyl of from 1 to 15 carbon atoms and R1 and R2 can be the same or different and are hydrocarbyls of from 1 to 15 carbon atoms or R1 and R2 together with the nitrogen atom to which they are bonded are joined together to form a heterocyclic group, optionally containing one or more additional heterocyclic atoms, or one of R1 and R2 together with the nitrogen atom to which it bonded are joined together with the carbonyl radical to form a heterocyclic group, optionally containing one or more additional heterocyclic atoms to form a ?-chloro vinyl carbonyl compound intermediate of the general formula wherein R has the aforestated meanings; and (b) reacting the ?-chloro vinyl carbonyl compound in
    Type: Grant
    Filed: July 2, 2004
    Date of Patent: November 8, 2005
    Assignee: Glenmark Pharmaceuticals Limited
    Inventors: Bobba Venkata Siva Kumar, Vishvas Dattatraya Patil, Changdev Namdev Raut, Shekhar Bhaskar Bhirud, Batchu Chandrasekhar