3-(Trifluoromethoxy)benzylamine → 4-chloro-7-(3-trifluoromethoxy-benzylamino)-2H-phthalazin-1-one

Participants

Reaction Steps

A mixture 6-bromo-4-chloro-2H-phthalazin-1-one and 7-bromo-4-chloro-2H-phthalazin-1-one (150 mg, 0.58 mmol), 3-(trifluoromethoxy)benzylamine (0.08 mL, 0.636 mmol), Pd2(dba)3 (61 mg, 0.0667 mmol), rac-BINAP (120 mg, 0.193 mmol) and NaOt-Bu (155 mg, 1.613 mmol) in DMA (8 mL) was heated at 80° C. for 1 h. The mixture was allowed to cool. 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). Chromatography on silica (EtOAc/hexanes) afforded 4-chloro-7-(3-trifluoromethoxy-benzylamino)-2H-phthalazin-1-one (28 mg) as an off white solid, 1H (600 MHz, CDCl3) δ: 4.50 (s, 2H), 7.06 (dd, 1H), 7.14 (d, 1H), 7.18 (s, 1H), 7.28 (d, 1H), 7.38 (t, 1H), 7.44 (d, 1H), 7.78 (d, 1H), 9.48 (s, 1H), m/z (M+1) 369.93; 4-chloro-6-(3-trifluoromethoxy-benzylamino)-2H-phthalazin-1-one (22 mg) as an off white solid, 1H (600 MHz, CDCl3) δ: 4.41 (s, 2H), 6.83 (d, 1H), 6.98 (dd, 1H), 7.08 (bd, 1H), 7.16 (bs, 1H), 7.25 (s, 1H), 7.32 (t, 1H), 8.06 (d, 1H), 10.15 (s, 1H) ppm. m/z (M+1) 369.93.

Provenance & Evidence