Sodium Carbonate → 5-(3-Chloropyridin-4-yl)-N4-cyclopentylpyrimidine-2,4-diamine

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To a solution of 2 (2.57 g, 10.0 mmol) in dioxane (75 mL) were added 3-chloropyridine-4-boronic acid (4.72 g, 10.0 mmol), trans-dichlorobis(triphenylphosphine)-palladium(II) (702 mg, 1.0 mmol), and sodium carbonate (3.82 g, 36 mmol, in 36 mL of water). The mixture thus obtained was purged with N2 for 10 min and heated at 120° C. in a sealed tube for 22 h. The reaction mixture was diluted with water and the product was extracted with chloroform. The organic layers were dried (MgSO4) and concentrated. The residue was purified by flash chromatography on silica gel eluting with 2.5% methanol in dichloromethane to give the title compound (3) as a white solid (2.31 g, 80%). 1H NMR (500 MHz, DMSO-d6) δ 8.64 (1H, s), 8.50 (1H, d, J=4.9 Hz), 7.51 (1H, s), 7.34 (1H, d, 1H, J=4.9 Hz), 6.21 (2H, d, 1H, br s), 5.97 (1H, d, J =7.6 Hz), 4.43 (1H, p, J=7.4 Hz), 1.84 (2H, m), 1.62 (2H, m), 1.40-1.49 (4H, m) ppm; LCMS-ESI (POS), M/Z, M+1: Found 290.0, Calculated 290.1.

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