The acylation of 4-(aminomethyl)benzoic acid (I) with trifluoroacetic anhydride gives the corresponding trifluoroacetamide (II), which is condensed with the monoprotected ortho-phenylenediamine (III) by means of oxalyl chloride in dichloromethane/DMF yielding the benzamide (IV). Elimination of the trifluoacetyl group of (V) by means of K2CO3 in methanol/water affords the 4-(aminomethyl)-derivative (V), which is condensed with 3-(hydroxymethyl)pyridine (VI) and carbonyldiimidazole (CDI) in THF providing the Boc-protected intermediate (VII). Finally, this compound is deprotected by a treatment with 4N HCl in dioxane/water.
The reaction of 4-(aminomethyl)benzoic acid (I) with 3-pyridinylmethanol (II) and CDI by means of DBU and TEA in THF gives the carbamate (III), which is treated with oxalyl chloride in toluene to yield the corresponding acyl chloride (IV). Finally, the condensation of (IV) with 1,2-phenylenediamine (V) by means of imidazole in THF affords the target compound. Alternatively, the condensation of acyl chloride (IV) with 2-nitroaniline (VI) by means of pyridine gives the corresponding amide (VII), which is finally reduced with SnCl2 and ammonium acetate in methanol.