Process for producing 3-imidazolylmethyltetrahydrocarbazolones
CA 1281722 C · Owner: Bell, James Angus · Inventors: Humber, David Cedric; Ewan, George Blanch; Coates, Ian Harold
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the preparation of a compound of general formula (I) (I), wherein, R1 represents a hydrogen atom or a C1-10 alkyl C3-7 cycloalkyl, C3-7 cycloalkyl-(C1-4)alkyl C3-6, alkenyl, C3-10 alkynyl, phenyl or phenyl-(C1-3)alkyl group, and one of the groups represented by R2 R3 and, R4 is a hydrogen atom or a C1-6 alkyl C3-7 cycloalkyl, C2-6 alkenyl or phenyl-(C1-3)alkyl group and each of the other two groups, which may be the same or different represent a hydrogen atom or a C1-6 alkyl group; or a salt or protected derivative thereof by, cyclisation of a compound of general formula (II) (II), wherein R1, R2, R3 and R4 are as defined above or a, salt or a …
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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
- Granted March 19, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 19, 2008.
- 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.