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Paper | Regular issue | Vol 38, No. 8, 1994, pp.1919-1926
Published online, 1st January, 1970
DOI: 10.3987/COM-94-6771
Synthesis of 4-Hydroxy- and 4-Alkoxyquinolinequinones Using Oxidative Demethylation with Cerium(IV) Ammonium Nitrate

Yashiyasu Kitahara, Takanobu Yonezawa, and Akinori Kubo*

*Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan


4-Hydroxy-5,8-quinolinediones (11), 4-hydroxy-5,6-quinolinedione (12), 4-alkoxy-5,8-quinolinediones (14, 15), 4-alkoxy-5,6-quinolinediones (16a, 17a), and 4-alkoxy-7,8-quinolinediones (16b, 17b) were synthesized by oxidative demethylation of the corresponding 4(1H)-quinolinones (6) and 4-alkoxyquinolines (9, 10) with cerium (IV) ammonium nitrate.