Abstract
A series of 7-substituted 1, 4-dihydro-4-oxo-1-vinyl-1, 8- and 1, 6-naphthyridine-3-carboxylic acids (5a-e and 13a-c) was prepared. During the preparation of 5a, unexpected compounds (4, 7 and 8) were also obtained. Structural elucidation of these compounds was achieved on the basis of chemical and spectral (ultraviolet, mass and proton nuclear magnetic resonance) data. The structure-antibacterial activity relationships are discussed.
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