Process for the preparation of 2,3- dihydrobenzopyranone derivatives
CA 1262139 C · Owner: Merlini, Lucio · Inventors: Merlini, Lucio; Arnoldi, Anna
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is a process for producing a 2,3-dihydro-4H-1-benzopyran-4-one of the formula, wherein, each of R1 and R2 being the same or different, is hydrogen or C1-C10 alkyl; or R1 and R2, taken together, form a C5-C7 cycloalkyl ring; R3 is hydrogen, C1-C10 alkyl or phenyl; R4 is hydrogen or C1-C6 alkyl;, R5 is -OR9 or -SR9 wherein R9 is hydrogen or C1-C6 alkyl; each of R6 R7 and R8, being the same or different is hydrogen C1-Cl2 alkyl or phenyl; and the salts, thereof with bases; which is useful as medicine for central nervous system as well as intermediate for producing other medicines the process comprising:, reacting a compound of the formula with a compound of the, formula 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 October 3, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 3, 2006.
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Timeline
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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.