1-Methylpiperazine → 1-(5-Bromopyridin-3-yl)-4-methylpiperazine

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Trial # 3: 3,5-dibromopyridine (1000 mg, 4.22 mmol), 1-methylpiperazine (423 mg, 4.22 mmol), Pd2(dba)3 (387 mg, 0.42 mmol), XANTPHOS (366 mg, 0.63 mmol), SODIUM TERT-BUTOXIDE (609 mg, 6.33 mmol), PhCH3 (10 mL) as added to a 10 mL microwave vial. This was degassed and refilled with N2 and then heated at 140 °C in microwave for 1h. LCMS showed reaction done with the peak at Rf0.52 showed a fragment mass of 256. Evaporated solvent. Residue purified by (CH3CN/H2O 0-30%+TFA buffer )to get the desired product 1-(5-bromopyridin-3-yl)-4-methylpiperazine (107 mg, 9.90 %). Trial # 1 3,5-dibromopyridine (1000 mg, 4.22 mmol), 1-methylpiperazine (423 mg, 4.22 mmol), Pd2(dba)3 (387 mg, 0.42 mmol), XANTPHOS (366 mg, 0.63 mmol), [Reactants], PhCH3 (5 mL) as added to a 10 mL microwave vial. This was degassed and refilled with N2 and then heated at 140 °C in microwave for 1h. LCMS showed reaction done with no desired peak formed. Trial # 2: 3,5-dibromopyridine (400 mg, 1.69 mmol), 1-methylpiperazine (169 mg, 1.69 mmol), Pd2(dba)3 (155 mg, 0.17 mmol), XANTPHOS (117 mg, 0.20 mmol), SODIUM TERT-BUTOXIDE (243 mg, 2.53 mmol), PhCH3 (5 mL) as added to a 10 mL microwave vial. This was degassed and refilled with N2 and then heated at 140 °C in microwave for 1h. LCMS showed reaction done with the peak at Rf0.46 showed a fragment mass of 256. Evaporated solvent. Residue purified by (CH3CN/H2O 0-30%+TFA buffer )to get the desired product 1-(5-bromopyridin-3-yl)-4-methylpiperazine (92 mg, 21.27 %).

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