Substitution of a nitro group by diazonium salts in σH-Adducts of carbanions to mono-nitrobenzenes. Formation of substituted azobenzenes and indazoles
作者:Zbigniew Wróbel、Bogdan Wilk、Andrzej Kwast
DOI:10.1016/j.tet.2021.132186
日期:2021.6
the nitro group. The so-formed intermediates eliminate HNO2 molecule under action of base, yielding substituted azobenzenes. Adducts of secondary carbanions, stabilized by cyano or sulfonyl groups to the ortho positions of nitrobenzenes, cyclize in situ to substituted indazoles. Some ortho σH-adducts of 1-chloroethyl phenyl sulfone carbanion add diazonium cations at meta position to the nitro group