Resolution of racemic derivatives of 5-(1-methyl-5- methylthiopyrrol-2-oyl)-1,2-dihydro-3h-pyrrolo(1,2- a) pyrrole-1-carboxylic acid and analogs
CA 1235699 A · Owner: Merck & Co. Inc. · Inventors: Hagmann, William K.
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Its claims, description and drawings are in the Canadian Patents Database.
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TITLE OF THE INVENTION, RESOLUTION OF RACEMIC DERIVATIVES OF 5-(1-METHYL-5-METHYLTHIOPYRROL-2-OYL)-1,2-DIHYDRO-3H- PYRROLO1,2-aPYRROLE-1-CARBOXYLIC ACID AND ANALOGS ABSTRACT OF THE INVENTION, Racemic mixture of derivatives of 5-(1-methyl-5-methylthiopyrrol-2-oyl)-1,2-dihydro-3Hpyrrolo1,2 apyrrole-1-carboxylic acid and analogs were resolved into pure 1- or d-isomers via concomitant isomerization and functional crystallization.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted April 26, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 26, 2005.
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