Synthesis of 5,8- and 5,6-Quinolinediones Using Oxidative Demethylation with Cerium(IV) Ammonium Nitrate.
作者:Yoshiyasu KITAHARA、Masanori NAGATSU、Yoshikazu SHIBANO、Akinori KUBO
DOI:10.1248/cpb.45.1697
日期:——
4-Phenyl-5, 8-quinolinediones (7, 8, 12, 13), 4-phenyl-5, 6-quinolinediones (9, 14), and 2-dialkylamino-4-phenyl-5, 8-quinolinediones (17, 18), were synthesized by oxidative demethylation of the corresponding 5, 8-dimethoxy- or 5, 6, 8-trimethoxy-4-phenylquinolines with cerium(IV) ammonium nitrate. Sulfur-containing quinolinequinones (21, 24) were prepared by oxidation of the corresponding 5, 8-dimethoxy- or 5, 6, 8-trimethoxy-2(1H)-quinolinethiones (20, 23).
4-苯基-5, 8-喹啉二酮(7, 8, 12, 13)、4-苯基-5, 6-喹啉二酮(9, 14)和2-二烷基氨基-4-苯基-5, 8-喹啉二酮(17, 18)通过将相应的5, 8-二甲氧基或5, 6, 8-三甲氧基-4-苯基喹啉与硝酸铈(IV)发生氧化去甲基化反应合成。含硫的喹啉喹醌(21, 24)则通过氧化相应的5, 8-二甲氧基或5, 6, 8-三甲氧基-2(1H)-喹啉硫酮(20, 23)制备而成。