2-Functionalized 4-nitroanilines were readily synthesized by ring transformation using 3,5-dinitro-2-pyridone and enaminones prepared from 1,3-dicarbonyl compounds and amines. Modification of the amino group and the ortho-position could be achieved by simply changing the enaminones. Using this strategy, functional groups such as acetyl, benzoyl, and ethoxycarbonyl groups could be introduced into the nitroaniline framework.

中文翻译：

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二硝基吡啶酮与烯胺酮的环转化合成功能化的4-硝基苯胺

通过使用由1,3-二羰基化合物和胺制备的3,5-二硝基-2-吡啶酮和烯胺酮，通过环转化，可以轻松合成2-官能化的4-硝基苯胺。氨基和邻位的修饰可以通过简单地改变烯胺酮来实现。使用这种策略，可以将诸如乙酰基，苯甲酰基和乙氧羰基的官能团引入硝基苯胺框架中。