... Tetrahedron. Volume 60, Issue 2, 5 January 2004, Pages 347–358. Cover image Cover image. Synthesis of 4- and 6-substituted nitroindoles. ... 12. A similar reaction of 3-nitroaniline 1a with aliphatic nitriles results in formation of 2-amino-4-nitro- and 2-amino-6-nitroindoles. ...