To a solution of 5-(3-iodo-1H-indol-5-yl)-1,2,4-oxadiazol-3-amine (0.15 g, 0.460 mmol) and isopropyl-(6-tributylstannanyl-pyrazin-2-yl)-amine (0.235 g, 0.549 mmol) was bubbled N2 gas for 15 min. To the mixture was added Cut (0.070 g, 0.366 mmol) and Pd(PPh3)4 (0.053 g, 0.043 mmol) and N2 gas was bubbled for another 15 min. The reaction was heated at 90° C. for 1 h. The mixture was cooled to RT, quenched with H2O (100 mL) and extracted with EtOAc (2×100 mL). The organic layer was dried over anhydrous Na2SO4 and concentrated. The residue was purified with preparative HPLC (eluent: 10-60% AcCN in H2O with 0.01% TFA) to give 5-(3-(6-(isopropylamino)pyrazin-2-yl)-1H-indol-5-yl)-1,2,4-oxadiazol-3-amine (0.015 g, 10%) as a pale yellow solid. MS (ESI, pos. ion) m/z: 336.2 (M+1); 1H-NMR (400 MHz, CD3OD): δ 9.34 (s, 1H), 8.09 (s, 1H), 8.04 (d, J=0.8 Hz, 1H), 7.88 (d, J=8.4 Hz, 1H), 7.56 (d, J=8.8 Hz, 1H), 4.39 (m, 1H), 1.38 (dd, J=6.8, 1.2 Hz, 6H).
