Ammonium Chloride → N4-(5-chloro-4-pyrazolo[1,5-a]pyridin-3-ylpyrimidin-2-yl)-5-methoxy-N1-methyl-N1-[2-(4-methylpiperazin-1-yl)ethyl]benzene-1,2,4-triamine

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A mixture of N-(5-chloro-4-pyrazolo[1,5-a]pyridin-3-ylpyrimidin-2-yl)-2-methoxy-N′-methyl-N′-[2-(4-methylpiperazin-1-yl)ethyl]-5-nitrobenzene-1,4-diamine (0.182 g, 0.33 mmol), iron (0.110 g, 1.98 mmol) and NH4Cl (0.012 g, 0.23 mmol) in EtOH (10 mL) and water (3.33 mL) was heated at reflux for 1.5 h. The mixture was then cooled to r.t., filtered and concentrated in vacuo. Purification by ion exchange chromatography, using an SCX column and eluting with 1M methanolic ammonia provided a brown gum (162 mg) after concentration of appropriate fractions. Further purification by FCC, eluting with 2-7% 1M methanolic ammonia in CH2Cl2 gave the title compound (0.148 g, 86%) as a yellow gum; 1H NMR: (CDCl3) 2.28 (3H, s), 2.32-2.63 (10H, m), 2.70 (3H, s), 2.98 (2H, t), 3.84 (3H, s), 4.05 (2H, d), 6.71 (1H, s), 6.95 (1H, td), 7.38 (1H, ddd), 7.52 (1H, d), 7.88 (1H, s), 8.36 (1H, s), 8.57 (1H, d), 8.65 (1H, d), 8.93 (1H, s); m/z: ES+ MH+ 522.57.

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