Abstract
A modified method of the Chichibabin amination reaction was carried out on 1, 5-, 1, 6-, and 1, 8-naphthyridines and their aminated compounds (II, VI, and VIII) were obtained in a high yield. A modified Skraup reaction was carried out on these aminated compounds, and on 3, 4- and 2, 6-diaminopyridines, in the presence of sulfo-mix, and using ferrous sulfate and boric acid as a catalyst. This reaction gave the objective pyridonaphthyridines of the angular type, 4, 5, 9-triazaphenanthrene (III), and its methyl derivative (IV) but not the linear type.
