Intermediates for polycyclic quinonoid antibiotics
CA 1097345 A · Owner: Research Corporation · Inventors: Tsay, Yuh-Geng; Mills, John E.; Kende, Andrew S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a novel tetracyclic quinones particularly 7,10-dihydro-1,6,11 and 4,6,11-trihydroxy-5,9,12(8H)naphthacenetrione and the 1- and 4-ethers thereof which are useful as intermediates in the synthesis of (?)-7-deoxydaunomycinone and analogs thereof. The 7-deoxydaunomycinone derived from naturally occurring daunomycin is a known compound which, is itself an intermediate in the preparation of the clinically accepted anti-tumor antibiotics daunomycine and its derivative adriamycin.
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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 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 10, 1998.
- 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.