Synthesis and antimalarial activity of 8-[(1-alkyl-4-aminobutyl)amino]-6-methoxy-4-methylquinolines.

Three analogues of the causal prophylactic antimalarial primaquine were prepared and their antimalarial activity was evaluated. 8-[(1-Ethyl-4-aminobutyl)amino]-6-methoxy-4-methylquinoline (2a) demonstrated activity against Plasmodium berghei in mice at 20 mg/kg, with all animals cured at 320 mg/kg, and is without toxicity at 640 mg/kg. It also possessed outstanding causal prophylactic activity against Plasmodium cynomolgi in rhesus monkeys at very low dosages.