The review summarizes the existing methods for the synthesis of 3-nitrobenzofurans and their polycondensed derivatives which are valuable substrates for dearomatization of the furan ring. The main attention is paid to the electrophilic nitration of 3-unsubstituted benzofurans and the preparation of 5-amino- and 5-hydroxy-3-nitrobenzofurans via the Nenitzescu indole synthesis from quinones or quinone monoimines and β-nitroenamines.

中文翻译：

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3-硝基苯并呋喃的制备方法

该综述总结了合成 3-硝基苯并呋喃及其缩聚衍生物的现有方法，这些衍生物是呋喃环脱芳构化的宝贵底物。主要关注的是 3-未取代的苯并呋喃的亲电硝化和 5-氨基-和 5-羟基-3-硝基苯并呋喃的制备，通过Nenitzescu 吲哚合成从醌或醌单亚胺和 β-硝基烯胺。