Preparation of indole derivatives
CA 1071637 A · Owner: Sumitomo Chemical Company · Inventors: Morooka, Shigeaki; Tamoto, Katsumi; Matuura, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for preparing indole derivatives of the formula. (I), wherein R1 and R2 each are hydrogen. halogen C1-C3 alkyl, C1-C3 alkoxy, nitro, cyano or trifluoromethyl or when, taken together, form methylenedioxy; R3 is hydrogen halogen, C1-C3 alkyl, C1-C3 alkoxy, nitro cyano or, dimethylamino; and R4 is hydrogen or halogen which, comprises cyclixin a compound of the formula (III), wherein R1, R2, R3 and R4 are as defined above with an, acidic condensing agent. The indole derivatives of the formula (I) mentioned above are useful an a key intermediate for the preparation of benzodiazepine, which are useful as tranquilizers, muscle relaxants and the like.
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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 February 12, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 1997.
- 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.