Production of pyrrolopyrimidines and intermediates therefor
CA 2018875 C · Owner: Akimoto, Hiroshi · Inventors: Hitaka, Takenori; Miwa, Tetsuo; Akimoto, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided an improved process for producing novel compounds represented by the general formula: (see formula I), wherein the ring A represents a pyrrole ring which may be hydrogenated; X represents an amino, hydroxyl or mercapto group; R1, R2 and R3, each, being the same as or different from the other, represents hydrogen or an alkyl alkenyl or alkynyl, group which may be substituted; R4 represents OR5 wherein R5 represents hydrogen or a hydrocarbon group which may be substituted or NHCH(COOR6)CH2CH2COOR7 wherein R6 and R7 each represents hydrogen or a hydrocarbon group which may be substituted; and n represents an integer of 1 to 4 or a salt, thereof from compounds represented by …
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 June 13, 1990 and granted October 31, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 13, 2012.
- 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.