An enhancement of antimalarial activity by modification of the quinoline nucleus in the pa. maquine type occurs when a second RO-group is substituted in the 5-po~ ition. l~~~ This paper deals with the synthesis of related compounds containing the 5, 6-methylenedioxy-, 5, 6-ethylenedioxyand 5, 6-isopropylidenedioxy groups. Compounds of this type have been proposed during the malaria research program, a but apparently no report of their ...