Water → N-(5-Chloro-4-pyrazolo[1,5-a]pyridin-3-ylpyrimidin-2-yl)-4-[(3R)-3-dimethylaminopyrrolidin-1-yl]-6-methoxybenzene-1,3-diamine

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A mixture of 5-chloro-N-{4-[(3R)-3-dimethylaminopyrrolidin-1-yl]-2-methoxy-5-nitrophenyl}-4-pyrazolo[1,5-a]pyridin-3-ylpyrimidin-2-amine (Intermediate 19, 145 mg, 0.28 mmol), iron (95 mg, 1.71 mmol) and NH4Cl (11.4 mg, 0.21 mmol) was heated at reflux in ethanol (6 mL) and water (2 mL) for 1.5 h. The mixture was then cooled and concentrated in vacuo. The resulting residue was triturated using 10% CH3OH in CH2Cl2 (15 mL) for 15 minutes and the mixture was then filtered. The residues were triturated again using 10% CH3OH in CH2Cl2 (15 mL) and the mixture was filtered. The combined filtrates were washed with brine, dried (Na2SO4) and concentrated in vacuo. Purification by FCC, eluting with 2% 7N methanolic ammonia in CH2Cl2 gave the title compound (112 mg, 82%) as a yellow gum; 1H NMR: (CDCl3) 1.83-1.96 (1H, m), 2.08-2.23 (1H, m), 2.30 (6H, s), 2.82-2.92 (1H, m), 2.99-3.13 (2H, m), 3.17-3.28 (2H, m), 3.65 (2H, s), 3.84 (3H, s), 6.72 (1H, s), 6.96 (1H, td), 7.38 (1H, ddd), 7.52 (1H, s), 7.90 (1H, s), 8.36 (1H, s), 8.55-8.60 (1H, m), 8.65 (1H, dd), 8.94 (1H, s); m/z: ES+ MH+ 479.5.

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