Cyclic nitromethyl acetic acid derivatives
CA 2498186 A1 · Owner: Pfizer Inc. · Inventors: Derrick, Andrew Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides salts of formula (I) wherein X is a basic counterion selected from a group I or group II metal and a primary secondary or tertiary , amine; n is 0, 1 or 2; and Rl Rla, R2, R2a, R3, R3a, R4 and R4a are independently selected from H and C1-C6 alkyl or R1 and R2 or R2 and R3 are , taken together to form a C3-C7 cycloalkyl ring which is optionally , substituted with one or two substituents selected from C1-C6 alkyl which are , useful as intermediates in the preparation of cyclic and bicyclic amino acids. Processes for the preparation of the final products and for the conversion of the compounds of formula (.IOTA.) to amino acids are included.
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 September 22, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 22, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 22, 2025.
- 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.