Process for preparing pyrimidinetrione derivatives
CA 2049991 A1 · Owner: Valter, Karel · Inventors: Hugentobler, Stephane; Vachta, Jindrich; Valter, Karel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of a compound of a formula (I) wherein R1 and R2, which may be the same or different represent, aliphatic, araliphatic or aryl groups and R represents a group , -CH2CH(OCONH2)-CH2OX in which X is a C1-5 alkyl group which comprises reacting a compound of formula (II) wherein R1, and R2 and X are as defined above with a dihalophosphinyl or halosulphonyl isocyanate to obtain a compound of formula (III) wherein R1 and R2 and X are as defined above and Z is a group of formula -SO2Y or -POY2 wherein Y is a halogen atom followed by hydrolysis of the compound of formula (III) is described. Also described are several N-dihydroxyphosphoryl pyrimidinetrione derivatives …
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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 February 5, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 2013.
- 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.