Cesium carbonate → 4-amino-6-[[(1S)-1-[1-cyclopropyl-6-fluoro-7-(3-pyridyl)benzimidazol-2-yl]ethyl]amino]pyrimidine-5-carbonitrile

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-amino-6-[(S)-1-(7-bromo-1-cyclopropyl-6-fluoro-1H-benzoimidazol-2-yl)ethylamino]pyrimidine-5-carbonitrile (68 mg, 0.16 mmol), pyridine-3-boronic acid (26 mg, 0.21 mmol), tetrakis(triphenylphosphine)palladium (19 mg, 10 mol %) and caesium carbonate (106 mg, 0.33 mol) in dioxane (3 mL) and H2O (1.5 mL) was purged with argon gas then heated at 140° C., for 30 min, by microwave irradiation. After cooling to RT, the reaction mixture was diluted with MeOH and loaded into an Isolute® SCX-2 cartridge. The cartridge was washed with MeOH followed by 2M NH3/MeOH. The basic fractions were combined, concentrated in vacuo and the resulting residue purified by column chromatography (Si—PCC, gradient 0-10% MeOH in EtOAc) followed by reverse phase HPLC (Phenomenex Gemini 5 μm C18 on a gradient 10-90%, 0.1% NH4OH in acetonitrile/water) to afford 414 as a white solid (29 mg, 43%). LCMS (Method K): RT 2.80 min [M+H]+ 415.06. 1H NMR (CDCl3 400 MHz): δ 8.74 (1H, s), 8.66 (1H, dd, J=4.86, 1.69 Hz), 8.17 (1H, s), 7.86 (1H, s), 7.70 (1H, dd, J=8.79, 4.66 Hz), 7.43 (1H, dd, J=7.83, 4.85 Hz), 7.13 (1H, dd, J=10.24, 8.78 Hz), 6.45-6.14 (1H, br m), 5.97 (1H, m), 5.36 (2H, s), 2.95 (1H, m), 1.70 (3H, d, J=6.73 Hz), 1.02-0.09 (4H, m)

Provenance & Evidence