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

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A mixture of 5-chloro-N-[4-[(3S)-3-dimethylaminopyrrolidin-1-yl]-2-methoxy-5-nitrophenyl]-4-pyrazolo[1,5-a]pyridin-3-ylpyrimidin-2-amine (Intermediate 62, 295 mg, 0.58 mmol), iron (194 mg, 3.48 mmol) and NH4Cl (23 mg, 0.43 mmol) were heated at reflux in ethanol (12 mL) and water (4 mL) for 1.5 h. The mixture was then cooled and concentrated in vacuo. The residue was triturated in 10% CH3OH in CH2Cl2 (25 mL) for 15 minutes and then filtered. The residues were triturated again with 10% CH3OH in CH2Cl2 (25 mL) and 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 (260 mg, 94%) as a yellow gum; 1H NMR: 1.73-1.86 (1H, m), 2.01-2.12 (1H, m), 2.20 (6H, s), 2.81-2.91 (1H, m), 2.92-3.05 (2H, m), 3.16 (1H, dd), 3.2-3.27 (1H, m), 3.67 (3H, s), 4.25 (2H, d), 6.71 (1H, s), 6.93 (1H, s), 7.12 (1H, td), 7.3-7.37 (1H, m), 8.36 (1H, s), 8.38-8.46 (2H, m), 8.82 (1H, dt), 8.94 (1H, s); m/z: ES+ MH+ 479.5.

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