A microwave tube is charged with 8-Bromo-2-[4-(4-methyl-piperazin-1-yl)-phenyl]-quinoxaline (2.6 g, 6.783 mmol), 4-[2,6-Difluoro-4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-benzyl]-morpholine (Step 87.1, 2.68 g, 7.12 mmol), S-Phos (258 mg, 0.611 mmol), K3PO4 (4.41 g, 20.4 mmol) and Pd(OAc)2 (45.68 mg, 0.203 mmol). After several cycles of vacuum/purge with argon, a mixture of 370 μl deionized water in 30 ml 1,2-dimethoxy-ethane is added. The reaction mixture is then heated to 105° C. for 12 h. After cooling, the reaction mixture is diluted with CH2Cl2, poured onto a saturated solution of NaHCO3 and extracted 3× with CH2Cl2. The combined organic layers are washed with water, brine, dried over Na2SO4, filtered and the filtrate is concentrated in vacuo. The residue is purified by chromatography (silicagel, CH2Cl2/CH2Cl2:EtOH:NH3 90:9:1 4:6) to afford the title compound as yellow solid, Rt=0.742 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: 516 (M+1)+.
