Thieno[2,3-c]-(4) and thieno[3,2-c]-cinnolines (7) have been obtained by diazotisation and internal coupling of the corresponding 2-(o-aminophenyl)thiophenes. By the same reaction 3-(o-aminophenyl)-2,5-dimethylthiophene gives 1,3-dimethylthieno[3,4-c]cinnoline (9).
J. W. Barton, D. J. Lapham and D. J. Rowe, J. Chem. Soc., Perkin Trans. 1, 1985, 131 DOI: 10.1039/P19850000131
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