Whereas anils (4) derived from 3-nitrothiophen-2-carbaldehyde undergo reductive cyclisation with triethyl phosphite to give the expected 2-arylthieno-[3,2-c]pyrazoles (5), the isomeric anils (6) and (7), derived from 2-nitrothiophen-3-carbaldehyde, give the 1-arylpyrrole-3-carbonitriles (8) and (9), respectively as the major products.
V. M. Colburn, B. Iddon, H. Suschitzky and P. T. Gallagher, J. Chem. Soc., Chem. Commun., 1978, 453 DOI: 10.1039/C39780000453
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