The starting material 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrrolo[2,3-b]pyridine (124) (50 mg, 0.205 mmol, 1 eq) and 1-(6-chloropyrazin-2-yl)indoline (88) 423 mg, 0.185 mmol, 0.9 eq) in DME (7 mL) was degassed and purged under argon atmosphere for 10 min. To this reaction mixture was charged Cs2CO3 (133 mg, 0.410 mmol, 2 eq) followed by addition of Pd(dpp)Cl2 (6 mg, 0.00819 mmol, 0.04 eq) and degassing and purging under argon for additional 10 minutes was performed. The reaction mixture was heated at 90° C. for 12 h in a sealed tube. After completion of the reaction, the reaction mixture was diluted with CHCl3 and filtered through Celite. The solvents were distilled off and the crude material was submitted for flash column purification in neutral alumina using 1% MeOH/CHCl3 to obtain pale yellow solid compound 5-(6-(indolin-1-yl)pyrazin-2-yl)-1H-pyrrolo[2,3-b]pyridine 134 in 12 mg quantity. The compound 134 was confirmed by 1HNMR and LCMS. 1H NMR (400 MHz, CDCl3) δ: 9.06 (s, 2H), 8.59 (s, 1H), 8.60 (s, 1H), 8.55 (s, 1H), 8.44 (m, 1H), 8.16 (s, 1H), 7.41 (m, 1H), 6.99 (m, 1H), 4.21 (m, J=8.53, 2H), 3.33 (m, J=341.82, 2H); MS m/z 313.9 (M+H)+.
