Process for the preparation of 7-substituted-hept-6-enoic and -heptanoic acids and derivatives and intermediates thereof
CA 2000553 C · Owner: Repic, Oljan · Inventors: Kapa, Prasad K.; Lee, George T.; Hess, Petr
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel process for the preparation compounds of formula I (See formula I), wherein, X is -CH2CH2- or -CH=CH-; R is an ester group inert to the reaction conditions; and R is an organic radical having groups which are inert under reducing conditions, by stereoselective reduction of a corresponding compound of formula II (See formula II), wherein, R, R2 and X are as defined above and one of Z1 and Z2 is oxygen and the other is hydroxy and hydrogen is disclosed. The compounds of formula I are pharmaceuticals especially anti-, atherosclerotic, antihyperlipidemic and antihypercholesterolemic agents.
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 October 12, 1989 and granted December 4, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 12, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 2011.
- 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.