Process for producing erythromycin derivative
CA 2597514 A1 · Owner: Kurita, Mitsuhiro · Inventors: Kurita, Mitsuhiro; Tsuzaki, Kaname; Shimizu, Hitoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for preparing a fumarate salt of a compound represented by Formula (II):, (see formula I) (wherein R1 represents a hydrogen atom or a lower alkyl group, and R2 represents a lower alkyl group) which , comprises carbamating a compound represented by Formula (I) :, (see formula II) , (wherein R1 represents a hydrogen atom or a lower alkyl group), removing all carbamate groups from this compound alkylating the nitrogen atom at the 3'-position of the desosamine ring in the resulting compound to give the compound represented by Formula (II), and converting this compound into a fumarate salt, wherein the compound represented by Formula (I) is carbamated in the presence of a cyclic …
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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 August 31, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 31, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 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.