Title compds. [I; X = CH, N; R = H, alkylthio, alkylamino, cycloalkyl, cycloalkylthio, cycloalkylamino, alkyl, etc.; R1 = NHR6, N(R6)2; R6 = alkyl, cycloalkyl, pyrrolidinyl, morpholino, hexahydroazepinyl, (substituted) (hetero)aryl(alkyl)], were prepd. Thus, title compd. (II) (multistep prepn. outlined) after 48 h reduced cellular viability of SaOS-2 cells to 15.1% of controls
