Process for the preparation of 2,3,5-tri-o-acetyl-4-pentulosonic acid methyl ester
CA 2572407 A1 · Owner: Michigan State University · Inventors: Hollingsworth, Rawle I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Processes for the preparation of , tri-O-acetyl-4-pentulosonic acid esters are described. In a preferred embodiment, the invention comprises a process for preparing tri-O-acetyl-D-erythro-4-pentulosonic acid methyl ester. These compounds are suitable intermediates in the preparation of pyrrolidines and "aza-sugar" analogs of D-ribofuranose.
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 May 14, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 14, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 2023.
- 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.