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Expired Canadian patentCanada

3'-tosylcytidine compounds and process for production thereof

CA 2012095 C · Owner: Acic (Canada) Inc. · Inventors: Radatus, Bruno Konrad; Karimian, Khashayar

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Abstract From the Canadian patent

Novel compounds of Formula I, or, pharmaceutically acceptable salts thereof are provided:, (I), wherein Y is selected from p-toluenesulfonyl and -SO2CF3 and R2 is selected from the group comprising hydrogen trityl, methoxytrityl, dimethoxytrityl acetyl, a C2-C6, alkylacyl group, a C6-C9 arylacyl group allyl, 2,2,2-, trichloroethyl, phosphates and salts thereof tosyl and, mesyl. A process for the production of cytidine compounds, including the compounds of Formula I is, provided and comprises reacting a 2',3'-Odialkylstannylene cytidine-type compound with an amine in the presence of a sulfonyl compound. Compounds of Formula I can be used to inhibit RNA synthesis.

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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

  • Filed March 13, 1990 and granted July 23, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 13, 2010.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 2012.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 13, 1990
GrantedJuly 23, 1996
Term endedMarch 13, 2010
Patent numberCA 2012095 C
Classification (IPC)C07H19/06 +1 more

Timeline

Timeline From CIPO dates

1991199319951997199920012003200520072009Application filedMarch 13, 1990Patent grantedJuly 23, 1996Term endedMarch 13, 2010

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.