Diazotization of 7-amino-5,8-dimethyl-6-thiophenylisoquinoline with sodium nitrite in acetic acid gives a mixture of 6-thiaellipticine and 5-methyl-4-thiophenyl-3H-pyrazolo[3,4-h]isoquinoline, a new heterocyclic ring system whose crystal structure is presented.
R. B. Miller, J. G. Stowell, C. W. Jenks, S. C. Farmer, C. E. Wujcik and M. M. Olmstead, Chem. Commun., 1996, 2711 DOI: 10.1039/CC9960002711
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