C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 205/37 (2006.01)
Patent
CA 2143725
A process for the industrial preparation of the quinone derivative represented by the following general formula: Image which is a preparation intermediate for chroman derivatives useful as a blood suger lowering agent, and novel intermediates, are provided. A preparation process for preparing the above quinone derivative encompasses the following: (1) Oxidation of the corresponding hydroquinone derivative, and (2) Hydrolysis of the corresponding acyl hydroquinone derivative with a Claisen alkali, followed by the oxidation of resulting hydrolyzate.
Hamamura Kimio
Konishi Masayuki
Seki Chiaki
Eisai Co. Ltd.
Marks & Clerk
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