Br[C:2]1[N:3]=[CH:4][C:5]([NH2:8])=[N:6][CH:7]=1.[CH3:9][C:10]1([CH3:21])[C:14](C)(C)OB(CC(C)=C)O1.[F-].[Cs+]>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].C(Cl)Cl>[CH3:14][C:10](=[CH2:9])[CH2:21][C:2]1[N:3]=[CH:4][C:5]([NH2:8])=[N:6][CH:7]=1To a solution of 5-bromopyrazin-2-amine (1 g, 5.75 mmol) in was added 4,4,5,5-tetramethyl-2-(2-methylallyl)-1,3,2-dioxaborolane (1.360 g, 7.47 mmol), PdCl2(dppf)-DCM adduct (0.469 g, 0.575 mmol), CsF (2.62 g, 17.24 mmol), purge though nitrogen. The reaction mixture was stirred at 100° C. in oil bath for 3h. The reaction mixture was partitioned between EtOAc and water. The organic was washed with brine, dried and concentrated. The residue was dissolved in 1N HCl (10 mL) The aqueous layer was back extracted with EtOAc, The aqueous was then neutralized to pH=8, then extracted by EtOAc 3 times. The organic was then dried and concentrated. The crude product was used in next step reaction. LCMS (m/z): 150.5 (MH+), 0.28 min.
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