Optically active 3,4-dihydrobenzoxazine derivatives and process for preparing the same
CA 1305705 C · Owner: Daiichi Seiyaku Co. Ltd. · Inventors: Hayakawa, Isao; Atarashi, Shohgo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optically active 3,4-dihydrobenzoxazine derivative compound represented by the general formula (III) (III), wherein X1, x2 and X3, which may be the same or different each represents a hydrogen atom or a halogen atom and R1, represents an alkyl group having 1 to 6 carbon atoms and, the salts thereof, a process for preparing the same and an intermediate of 2H-benzoxazine compound represented by the formula (II), (II), wherein X1 represents a hydrogen atom or a halogen atom X2, and X3 each represents a halogen atom and R1 represents an, alkyl group having 1 to 6 carbon atoms and the salts, thereof, useful for synthesizing the above mentioned optically active 3,4-dihydrobenzoxazine are …
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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 July 28, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 28, 2009.
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Timeline
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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.