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Methods for the Preparation of 3-Nitrobenzofurans
Chemistry of Heterocyclic Compounds  (IF1.277),  Pub Date : 2021-06-26, DOI: 10.1007/s10593-021-02957-9
Vitaly А. Osyanin, Dmitry V. Osipov, Darya А. Rashchepkina, Yuri N. Klimochkin

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.