Cl[C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[C:5](=[O:12])[NH:4][N:3]=1.[Cl:13][C:14]1[CH:15]=[C:16](B(O)O)[CH:17]=[CH:18][CH:19]=1.[O-]P([O-])([O-])=O.[K+].[K+].[K+].N#N>C1COCC1.O>[Cl:13][C:14]1[CH:19]=[C:18]([C:2]2[C:11]3[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=3)[C:5](=[O:12])[NH:4][N:3]=2)[CH:17]=[CH:16][CH:15]=1
A solution of 1-chlorophthalazine-4-one (1.0 g, 5.5 mmol), 3-chlorophenyl boronic acid (1.3 g, 8.3 mmol), tricyclohexyphosphine (0.058 g, 0.27 mmol), and K3PO4 (2.3 g, 11.0 mmol) in THF (20 mL) and water (5 mL) was degassed with N2 for 30 min then treated with tri(dibenzylideneacetone)-dipalladium (0.050 g, 0.05 mmol) and heated at reflux overnight. The reaction mixture was diluted with water (100 mL) and the product extracted with EtOAc (2×100 mL). The organics were washed with brine, dried over Na2SO4, and concentrated to give 4-(3-chlorophenyl)phthalazin-1(2H)-one (1.2 g), (MS: ESI +ve, 257.12 [M+H]). 1H NMR: (400 MHz, DMSO) δ: 7.58-7.60 (m, 2H), 7.61-7.64 (m, 2H), 7.65-7.67 (m, 1H), 7.90-7.93 (m, 2H), 8.34-8.36 (m, 1H). 12.93 (s, 1H).
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