2,5-Difluorobenzylamine → 4-chloro-6-(2,5-difluoro-benzylamino)-2H-phthalazin-1-one

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A mixture 6-bromo-4-chloro-2H-phthalazin-1-one (48 mg, 0.185 mmol), 2,5-difluorobenzylamine (0.026 mL, 0.222 mmol), Pd2(dba)3 (6 mg, 0.0066 mmol), rac-BINAP (21 mg, 0.021 mmol) and NaOtBu (45 mg, 0.468 mmol) in DMA (3 mL) was heated in a microwave at 90° C. for 5 minutes. The mixture was allowed to cool, diluted with EtOAc and washed with water. The organic layer was washed with sat.aq. NaHCO3, brine and dried (Na2SO4). Column chromatography (Hex/EtOAc) afforded 4-chloro-6-(2,5-difluoro-benzylamino)-2H-phthalazin-1-one (3 mg) as an off white solid, 1H (400 MHz, CDCl3) δ: 4.46 (s, 2H), 6.90 (m, 2H), 7.00 (m, 3H), 8.10 (d, 1H), 10.09 (s, 1H) ppm; m/z (M+1) 321.98.

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