Process for preparing beta-anomer enriched 2-deoxy-2,2-difluoro-d-ribofuranosyl-arylsulfonates
CA 2098885 C · Owner: Eli Lilly And Company · Inventors: Chou, Ta-Sen; Jones, Charles D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stereoselective process for preparing 2-deoxy- 2,2-difluoro-D-ribofuranosyl beta-anomer enriched aryl sulfonates or substituted arylsulfonates involving reacting a lactol with an acid scavenger and a sulfonating reagent in an inert solvent.
Read the whole patent
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 June 21, 1993 and granted July 29, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 21, 2015.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.