Disclosed is a salt of amonafide or amonafide analogs represented Structural Formula (I):
1
R1 is —(CH
2
)
n
N
+
HR3R4 X
−
or R1 is —(CH
2
)
n
N
+
HR3R4 X
−
or —(CH
2
)
n
NR3R4 when R2 is —N
+
HR6R7.
R2 is —OR5, halogen, —NR6R7, —N
+
HR6R7 X
−,
sulphonic acid, nitro, —NR5COOR5, —NR5COR5 or —OCOR5;
R3 and R4 are independently H, C1-C4 alkyl group or, taken together with the nitrogen atom to which they are bonded, a non-aromatic nitrogen-containing heterocyclic group;
each R5 is independently —H or a C1-C4 alkyl group;
R6 and R7 are independently H, C1-C4 alkyl group or, taken together with the nitrogen atom to which they are bonded, a non-aromatic nitrogen-containing heterocyclic group;
n is an integer from 0-3; and
X
−
is the carboxylate anion of an organic carboxylic acid compound.
Also disclosed are methods of preparing certain compounds represented by Structural Formula (I).