Reductive cyclisation of 4-(2-nitrophenyl)pyridine derivatives by triethyl phosphite afforded β-carboline and benzo[c][2,7]naphthyridine derivatives, the structures of which were elucidated by spectroscopic methods.
T. Kametani, K. Ogasawara and T. Yamanaka, J. Chem. Soc. C, 1969, 138 DOI: 10.1039/J39690000138
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