Aromatic nucleophilic denitrocyclization reactions

Sufficiently activated aromatic nitro groups are known to undergo replaceme nt with various nucleophiles. Intramolecular version of this reaction is ca lled aromatic denitrocyclization reaction. Five-, six-, seven-, and even ei ght-membered rings are formed with oxygen, sulfur, nitrogen, and carbon nuc leophiles involved. The present review covers the most important reactions of this type, such as the Turpin reaction and similar methods of preparatio n leading to phenothiazines, dihydrophenazines, dithiines, and dioxines, as well as some less frequent interesting reactions of this type.