Potential Antimalarials. IV. 4-[7'-Bromo(and Chloro)-1′,5′-Naphthyridin-4′-Ylamino]Phenols and N4-Substituted 7-Chloro-1,5-Naphthyridin-4-Amines

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Abstract
A series of nine mono- and di-Mannich bases, for example 4-(7′-bromo-1′,5′-naphthyridin-4′-ylamino)-2,6-bis( dimethylaminomethyl )phenol derived from 4-(7′-bromo-1′,5′-naphthyridin-4′-ylamino)phenol and several other N4-substituted 7-bromo- and 7-chloro-1,5-naphthyridin-4- amines have been prepared. ′All these compounds showed significant antimalarial activity when injected intraperitoneally in a single dose of 100-200 mg/kg to mice infected with Plasmodium vinckei vinckei. The di-Mannich bases appeared to be the most potent and effective in parasite control; however, no deaths were observed in infected mice treated with the mono- Mannich compounds.

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