Process for the production of 3,5,6-trihydroxyhexanoic acid derivative
CA 2005993 A1 · Owner: Inoue, Kenji · Inventors: Yonetsu, Keiichi; Ueyama, Noboru; Inoue, Kenji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound of a 3,5,6-trihydroxyhexanoic acid derivative of the formula:, (I), wherein P1 and P2 are independently hydrogen atoms or hydroxy-protecting groups, or together form a ring and R is, an alkyl group is effectively prepared by a process comprising steps of:, reacting a butyronitrile derivative of the formula:, (II), wherein P1 and P2 are the same as defined above with an .alpha.-haloacetate of the formula: X-CH2-COOR (III), wherein X is a halogen atom and R is the same as defined, above in the presence of a metallic catalyst selected from the group consisting zinc and zinc-copper to form a keto acid derivative of the formulas, (IV), wherein P1 P2 and R are the same as defined above …
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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 December 19, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 19, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2011.
- 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.