Imidazole and 2-phenylimidazole undergo intramolecular cycloadditions with 1,2,4-triazines tethered between an imidazole nitrogen and the triazinyl C3 position with a trimethylene chain to produce tetrahydro-1,5-naphthyridines following loss of N2 and a nitrile.
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Neipp et al. (1997) studied this question.
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