Cl[C:2]1[NH:3][C:4](=[O:13])[C:5]2[C:10]([CH:11]=1)=[C:9]([CH3:12])[CH:8]=[CH:7][CH:6]=2.[B:14]1(B2OC(C)(C)C(C)(C)O2)[O:18]C(C)(C)C(C)(C)[O:15]1.CC([O-])=O.[K+]>O1CCOCC1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[CH3:12][C:9]1[CH:8]=[CH:7][CH:6]=[C:5]2[C:10]=1[CH:11]=[C:2]([B:14]([OH:18])[OH:15])[NH:3][C:4]2=[O:13]3-Chloro-5-methyl-2H-isoquinolin-1-one (100 mg, 0.52 mmol), bis(pinacolato)diboron (157 mg, 0.62 mmol), Pd(dppf)Cl2 (42 mg, 0.054 mmol) and KOAc (153 mg, 1.56 mmol) in 1,4-dioxane (2 mL) were added to a microwave vial and the reaction mixture purged with N2 for 10 min. The reaction mixture was irradiated using a microwave reactor (300 W, 120° C., 20 min). The reaction mixture was passed through a Si-thiol cartridge and concentrated in vacuo. The crude product was purified by reverse phase preparative HPLC-MS to afford 5-methyl-1-oxo-1,2-dihydro-isoquinoline-3-boronic acid as a white solid (51 mg, 49%).
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