Asymmetric hydrogenation of dihydrofuroimidazole derivatives
CA 2111663 A1 · Owner: Eyer, Martin · Inventors: Fuchs, Rudolf; Eyer, Martin; Mcgarrity, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for asymmetric hydrogenation of a dihydrofuroimidazole derivative of the general formula (I): I, wherein R1 represents a cleavable protective group and R2 represents hydrogen or a cleavable protective group with, hydrogen in the presence of a homogeneous catalyst to produce the corresponding diastereomeric tetrahydrofuroimidazole derivative of the general formula (II):, II, Tetrahydrofuroimidazole derivatives of the general formula II are intermediate products for the production of vitamin (+)-biotin.
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 December 16, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 16, 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.