Reaction of (2,4,5-trimethoxyphenyl)(2-hydroxyphenyl)methanone with ceric ammonium nitrate furnished the xanthone, 2,3-dimethoxy-9H-xanthen-9-one. Under the same conditions the related (1,4-dimethoxynaphthalen-2-yl)(2-hydroxyphenyl)methanone resulted in the formation of 12a-methoxy-5H-benzo[c]xanthenes 5,7(12aH)-dione. Other examples of this novel transformation are also outlined.
(2,4,5-三
甲氧基苯基)(2-羟苯基)甲酮与
硝酸铈铵的反应提供了x吨酮
2,3-二甲氧基-9 H-黄原-9-酮。在相同条件下,相关的(
1,4-二甲氧基萘-2-基)(2-羟苯基)甲酮导致形成12a-甲氧基-5 H-苯并[ c ]
黄嘌呤5,7(12a H)-二酮。还概述了此新颖转换的其他示例。