A microwave tube is charged with 8-Bromo-2-chloro-quinoxaline (Step 1.4, 2.5 g, 10.267 mmol), 1-Methyl-4-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-piperazine (2.88 g, 9.24 mmol), K3PO4 (6.67 g, 30.8 mmol) and PdCl2(PPh3)2 (221 mg, 0.308 mmol). After several cycles of vacuum/purge with argon, a mixture of 21 ml of DMA and 560 μl deionized water is added. The reaction mixture is then heated to 105° C. for 4 h. After cooling, the suspension is poured onto de-ionized water and diluted with EtOAc. The phases are separated and the aqueous phase re-extracted twice with EtOAc. The combined organic phases are washed with saturated brine and dried over Na2SO4. After filtration, the mixture is concentrated in vacuo. The residue is purified by chromatography (silicagel, CH2Cl2:EtOH:NH3 95:4.5:0.5 from 1:0=>0:1) to afford the title compound as a yellow orange solid, Rt=0.930 min (Acquity HPLC BEH C18, 2.1×50 mm, 1.7 micron, detection 215 nM, 0.1 min 2% CH3CN in H2O, 2% to 100% CH3CN in H2O in 1.5 min, 0.4 min 100% CH3CN+0.1% TFA, flow rate 1.0 ml/min); MS: 383 (M+1, 79Br)+.
