Some 4-phenyl-1,8-naphthyridine derivatives with a piperazino group in the 2- and/or 7-position have been synthesized and evaluated for their tuberculostatic activity. The compounds 1, 6, 10, 17b,c and 19i showed a marked activity against Mycobacterium tuberculosis H37Rv. For this series of compounds, submitted to biological screening, no structure-activity relationship can be deduced.
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