Process for preparing 1-polyhaloalkyl-3, 4-dihydro-2-(1h)-quinazolinones
CA 1069505 A · Owner: Sumitomo Chemical Company · Inventors: Koshiba, Masao; Yamamoto, Michihiro; Katayama, Shigenari
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A NOVEL PROCESS, FOR PREPARING 1-POLYHALOALKYL-3,4-DIHYDRO- 2-(1H)-QUINAZOLINONES, ABSTRACT OF THE DISCLOSURE 3,4-Dihydro-2(1H)-quinazolinone derivatives of the formula, wherein R1 and R2 are each hydrogen lower alkyl, lower, alkylthio or lower alkoxy or, when taken together, R1, and R2 may form methylenedioxy; R3 is polyhalo-lower alkyl; R4 is phenyl, halophenyl, lower alkoxyphenyl lower alkylphenyl or thienyl; and X is oxygen or sulfur, which are known to be very useful intermediates for the preparation of anti-inflammatory and analgesic agents, are obtained in a high yield by reacting a compound of the formula, wherein R1, R2 R3 and X are as defined above, with, a compound of the formula …
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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 January 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
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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.