2-Amino-N-[5-(3,5-difluoro-benzyloxy)-1H-indazol-3-yl]-4-[(3-dimethylamino-propyl)-methyl-amino]-benzamide (150 mg, 0.29 mmol) in DCM (4 mL) was treated, at 4° C., under a nitrogen atmosphere, with tetrahydro-4H-pyran-4-one (0.34 mL, 0.37 mmol), TFA (0.23 mL, 2.95 mmol) and finally with tetramethylammonium triacetoxyborohydride ((204 mg, 0.74 mmol). After 1.5 hours DCM, was added (25 mL) and the organic layer was washed with water (25 mL), saturated NaHCO3 solution (25 mL) and brine. After drying over anhydrous sodium sulfate, removal of the solvent and purification of the crude over silica gel (DCM: 7N NH3 in MeOH 9:1), 80 mg of title compound were obtained in 46% yield.
