Cesium carbonate → HCID 178461950, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of [(S)-1-(7-bromo-6-fluoro-1-methyl-1H-benzoimidazol-2-yl)ethyl]-(9H-purin-6-yl)amine, (0.10 g, 0.26 mmol), phenylboronic acid (0.041 g, 0.33 mmol), tetrakis(triphenylphosphine)palladium(0) (0.015 g, 0.01 mmol) and caesium carbonate (0.17 g, 0.51 mmol) in dioxane (3 mL) and water (1.5 mL) was placed in a sealed tube and degassed with nitrogen for 5 minutes, then heated for 45 minutes at 140° C. by microwave irradiation. The resulting mixture was loaded onto an Isolute® SCX-2 cartridge then washed with MeOH and the product eluted with 2M NH3/MeOH and concentrated in vacuo. The residue was purified by chromatography (SiO2, 0-10% (2M ammonia in methanol) in DCM) then by preparative HPLC (Phenomenex Gemini 5 μm C18 on a 78 min gradient 20-98% 0.1% HCO2H in acetonitrile/water). The relevant fractions were concentrated to approximately ⅓ volume and partitioned between DCM (3×) and saturated aqueous NaHCO3. The combined DCM extracts were dried (Na2SO4) and concentrated in vacuo to give 431 as a white solid (0.075 g, 76%). LCMS (Method K): RT 3.21 min [M+H]+ 388.0. 1H NMR (DMSO-d6, 400 MHz): δ 12.98 (1H, s), 8.26-8.11 (2H, m), 7.93-7.86 (1H, m), 7.64 (1H, dd, J=8.82, 4.74 Hz), 7.54-7.39 (5H, m), 7.15-7.08 (1H, m), 5.82-5.71 (1H, m), 3.21 (3H, s), 1.65 (3H, d, J=6.74 Hz). Signals split due to presence of tautomers

Provenance & Evidence