The starting material 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrrolo[2,3-b]pyridine (124) (50 mg, 0.2 mmol, 1 eq) and 2-(4-(6-chloropyrazin-2-yl)piperazin-1-yl)ethanol (57) (49.5 mg, 0.2 mmol, 1 eq) in DME (5 mL) was degassed and purged under argon atmosphere for 10 min. To this reaction mixture was charged Cs2CO3 (133 mg, 0.4 mmol, 2 eq) followed by addition of Pd(PPh3)4 (1.0 mg, 0.04 mmol) and degassing and purging under argon for additional min. The reaction mixture was heated at 100° 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 3% MeOH/CHCl3 to obtain pale yellow solid compound 2-(4-(6-(1H-pyrrolo[2,3-b]pyridin-5-yl)pyrazin-2-yl)piperazin-1-yl)ethanol 126 in 15 mg quantity. The compound 126 was confirmed by 1HNMR and LCMS. 1H NMR (400 MHz, CDCl3) δ: 8.96 (s, 1H), 8.90 (s, 1H), 8.54 (s, 1H), 8.40 (s, 1H), 8.09 (s, 1H), 7.36 (m, J=289.99, 1H), 6.61 (m, J=301.8, 1H), 3.75 (m, J=5.0, 6H), 2.69 (m, J=4.84, 6H); MS m/z 324.9 (M+H)+.
