9- or 11-substituted apovincaminic acid derivatives and process for their preparation
CA 1266658 C · Owner: Moldvai, Istvan · Inventors: Szantay, Csaba; Stefko, Bela; Vedres, Andras
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
New, racemic and optically active 9- and 11substituted apovincaminic acid derivatives are disclosed of the formula:, (I), wherein, R is a 9- or 11-nitro or -amino group and salts, thereof. A process for the preparation of these compounds is also disclosed, which involves nitration of apovincaminic acid of the formula:, (II), and if desired reduction of the resulting 9- or 11-nitro substituted compound. The compounds of formula (I) are valuable intermediates in the synthesis of biologically active eburnane derivatives substituted in the ring A for, example nitro-apovincaminic acid esters or acylaminoapovincaminic acid 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
- Granted March 13, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 13, 2007.
- 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
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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.