Methyl 1-aryl-7-nitro-1H-thiopyrano[4,3,2-cd]indazol-4-carboxylates 2 and 1,5-diaryl-7-nitro-1,5-dihydropyrazolo[3,4,5-de]-cinnolines 4 were prepared based on 1-aryl-3-formyl-4,6-dinitro-1H-indazoles 1, which were synthesised previously starting from 2,4,6-trinitrotoluene.
Synthesis of 14π-electron peri-annelated tricyclic heteroaromatic systems based on 2,4,6-trinitrotoluene
A. M. Starostnikov, V. M. Vinogradov and S. A. Shevelev, Mendeleev Commun., 2002, 12, 200 DOI: 10.1070/MC2002v012n05ABEH001642
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