Unprecedented intramolecular nitrile imine cycloadditions onto a thiophene ring are described as a synthetic route to a number of tricyclic pyrazoline derivatives (5). Diadducts 6 and 7, which can be ascribed to a sequential intra–intermolecular cycloaddition pathway, are also formed.
G. Broggini, L. Garanti, G. Molteni and G. Zecchi, J. Chem. Soc., Perkin Trans. 1, 1998, 4103 DOI: 10.1039/A807441K
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