化学
钯
蒽醌类
光化学
碳酸钾
可见光谱
蒽
苯醌
催化作用
环加成
药物化学
有机化学
植物
物理
光电子学
生物
作者
Kiho Kim,Minsik Min,Sungwoo Hong
标识
DOI:10.1002/adsc.201601057
摘要
Abstract Irradiation of 9‐ester‐substituted anthracenes with visible light results in the formation of endoperoxides in the absence of a photocatalyst, which further undergo base‐assisted fragmentation to afford anthraquinones. The excited state species of anthracene generated by energy transfer, interacts with 3 O 2 to afford 1 O 2 by energy transfer and undergoes cycloaddition with 1 O 2 . By employing palladium(II)‐catalyzed and visible light‐mediated transformations, we have developed an efficient synthetic protocol for accessing diverse anthraquinones from readily available diaryl carboxylic acids. The optimal result was obtained with palladium(II) acetate, Ac‐Ile‐OH, benzoquinone and potassium carbonate in tert‐amyl alcohol under O 2 at 90 °C with irradiation from a 30 W fluorescent light bulb. magnified image
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