Substituted piperidine intermediates for producing heterocyclic-cyclic amine derivatives capable of inhibiting cholinesterase
CA 2195129 C · Owner: Nagel, Arthur A. · Inventors: Nagel, Arthur A.; Villalobos, Anabella; Chen, Yuhpyng L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a compound of the formula (See formula I), wherein W is a leaving group; j is an integer from 0 to 2; R10 is a nitrogen protecting group; and R7 and R8 are independently selected from hydrogen, (C1-C6)alkyl (C1-C6)alkoxycarbonyl, (C1-C6)alkylcarbonyl and (C1-C6)alkoxy, with the proviso that said (C1-C6)alkoxy is not attached to a carbon that is adjacent to a nitrogen. This compound is useful as an intermediate for producing a compound of the formula:, (See formula II), in which R1 and R2 are hydrogen alkoxy, benzyloxy, phenoxy, hydroxy, etc. X is a divalent group such as O S, etc. Y is, a divalent group such as alkylene M is CH or N, and L is, phenyl, phenylalkyl cinnamyl, …
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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 March 9, 1992 and granted September 10, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 9, 2014.
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