Process for the preparation of substituted ¬1,4 diazepino¬6,7,1-hi indol-4-ones
CA 2376707 A1 · Owner: Warner-Lambert Company · Inventors: Bernardelli, Patrick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for preparing enantiopure diazepino-indolone of formula (I) which consists in the intramolecular cyclisation of a product of formula (II) wherein A, B, X1, X2, Z Z1, Z2 and R are as defined in the , description in the presence of a weak Lewis acid catalyst.
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 29, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 29, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 29, 2022.
- 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.