Syntheses of anthyridines by thermal cyclisation of 2-ethoxycarbonylvinylamino-1,8-naphthyridines, from derivatives of 2,6-diaminopyridine, and from 3-substituted 2-amino-1,8-naphthyridines, have been investigated. Pyrimido[4,5-b][1,8]naphthyridines have been prepared by cyclisation of 2-acetamido-1,8-naphthyridine-3-carboxamides.
J. F. Harper and D. G. Wibberley, J. Chem. Soc. C, 1971, 2991 DOI: 10.1039/J39710002991
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