3-(4-Methylpiperazin-1-yl)-5-nitropyridin-4-amine → 5-(4-Methylpiperazin-1-yl)pyridine-3,4-diamine

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To a solution of 3-(4-methylpiperazin-1-yl)-5-nitropyridin-4-amine (LXX) (382 mg, 1.61 mmol) in MeOH (11 mL) was added 10% Pd/C. The solution was purged with hydrogen and stirred at room temperature under hydrogen for 4 h. The suspension was filtered through Celite® and the concentrated under vacuum to produce 5-(4-methylpiperazin-1-yl)pyridine-3,4-diamine (LXXI) as purple solid (330 mg, 1.59 mmol, 99% yield). 1H NMR (DMSO-d6, 500 MHz,): δ 2.18 (s, 3H), 2.34-2.36 (m, 4H), 3.13-3.16 (m, 4H), 3.89 (s, 2H), 5.20 (s, 2H), 5.94 (s, 1H), 7.31 (s, 1H); ESIMS found C10H17N5 m/z 208 (M+H).

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