Process for the preparation of 2-acyl-1,3,4,6,7,11b- hexahydro-2h-pyrazino-¬2,1-a -4-isoquinoleinones and intermediates
CA 1202629 A · Owner: Sanofi, S.A. · Inventors: Frehel, Daniel; Maffrand, Jean-Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1 -, ABSTRACT, 2-Acyl-1,3,4,6,7,11b-hexahydro-2H-pyrazino-2,1-a-4isoquinoleinones of the formula, are prepared from 4-acyl-2,6-dioxopiperazines by reaction with a phenethyl halide, selective reduction of one of the oxo groups and cyclisation, by the novel intermediates of formula, in which Y represents O or H,OH.
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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 April 1, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 1, 2003.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.