Patents by Inventor Vishvas Patil

Vishvas Patil 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
    Publication number: 20050240029
    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 inte
    Type: Application
    Filed: June 22, 2005
    Publication date: October 27, 2005
    Applicant: Glenmark Pharmaceuticals Limited
    Inventors: Bobba Venkata Kumar, Vishvas Patil, Changdev Raut, Shekhar Bhirud, Batchu Chandrasekhar
  • Process for the preparation of 4,4-dimethyl-6-ethynylthiochroman
    Publication number: 20050004373
    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: Application
    Filed: July 2, 2004
    Publication date: January 6, 2005
    Inventors: Bobba Kumar, Vishvas Patil, Changdev Raut, Shekhar Bhirud, Batchu Chandrasekhar