Synthesis of nojirimycin derivatives
CA 2027407 A1 · Owner: Fleet, George W. J. · Inventors: Fleet, George W. J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, Nojirimycin .delta.-lactam and deoxynojirimycin are each synthesized from 5,6-anhydro-3-O-benzyl- 1,2-O-isopropylidene-L-idofuranose as a divergent intermediate by a method which comprises formation of the piperidine ring by connection of nitrogen between C-1 and C-5 with inversion of configuration at C-5 to form nojirimycin .delta.-lactam or between C-2 and C-6 with inversion of configuration at C-2.
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 October 11, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 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.
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.