Process for the preparation of 2,2'-bipyrrolyl-pyrromethene (prodigiosins) derivatives
CA 2216465 A1 · Owner: Rossi, Arsenia · Inventors: Rossi, Arsenia; Tibolla, Marcellino; D'Alessio, Roberto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A new process is provided for the preparation of 5-(2H-pyrrol-2ylidene)methyl-2,2'-bi-1H-pyrrole derivatives of formula (I) wherein R1 represents hydrogen, phenyl, C1-C20 alkyl or C2-C20 alkenyl wherein the alkyl , and alkenyl groups may be unsubstituted or substituted by 1 to 3 substituents chosen independently from halogen, C1-C6 alkoxy hydroxy, aryl and aryloxy; R2 , represents hydrogen C1-C6 alkyl, cyano, carboxy or (C1-C6 alkoxy)carbonyl; R3 represents halogen, hydroxy or C1-C11 alkoxy unsubstituted or substituted by phenyl; R4 represents hydrogen, C1-C6 alkyl or phenyl; each of R5 and R6 independently represents hydrogen, C2-C20 alkanoyl C3-C20 alkenoyl, phenyl, C1-C20 alkyl or …
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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 January 22, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 22, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2019.
- 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
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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.