Mass spectra of some aminonaphthyridines and aminoquinolines

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Abstract
The mass spectra of all the aminoquinolines, the 2–, 3– and 4‐amino‐1,5‐naphthyridines, some amino‐1,6‐naphthyridines, and two amino‐1,8‐naphthyridines with methyl substituents are reported. The major fragment in the aminoquinolines is formed by the loss of HCN from the molecular ion. The most abundant fragment in the aminonaphthyridines is formed by the loss of HCN from the molecular ion except in the 2‐amino‐1,5‐naphthyridine isomer. In both 1,8‐naphthyridine isomers investigated, the loss of C2H2 is an alternate fragmentation pathway of significance. In all of the compounds investigated, the loss of the primary amino group from the molecular ion was found to be an insignificant fragmentation.
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