Cesium carbonate → 2-[2-(2-Hydroxyethyl)benzoimidazol-1-yl]-9-methyl-6-morpholin-4-yl-9H-purine-8-carbaldehyde

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A mixture of 2-chloro-9-methyl-6-morpholin-4-yl-9H-purine-8-carbaldehyde (500 mg, 1.78 mmol), 2-(1H-benzoimidazol-2-yl)ethanol (335 mg, 2.06 mmol), Pd2dba3 (40 mg, 0.043 mmol), Xphos (85 mg, 0.18 mmol) and cesium carbonate (840 mg, 2.58 mmol) in 1,4-dioxane (10 mL) was purged with argon gas then subjected to microwave irradiation at 145° C. for 30 min. The reaction mixture was filtered through a pad of Celite® and the filtrate was concentrated in vacuo. The resultant residue was purified by flash chromatography (Si—PPC, EtOAc: MeOH; 100:0 to 98:2 to 95:5 to 90:10) to afford 2-[2-(2-Hydroxyethyl)benzoimidazol-1-yl]-9-methyl-6-morpholin-4-yl-9H-purine-8-carbaldehyde as a yellow solid (487 mg, 67%). 1H NMR (CDCl3, 400MHz) 6 9.93 (s, 1 H); 8.16-8.12 (m, 1 H); 7.76-7.72 (m, 1 H); 7.35-7.29 (m, 2 H); 4.52 (m, 4 H); 4.20 (t, J=5.3 Hz, 2 H); 4.14 (s, 3 H); 3.91 (m, 5 H) and 3.57 (t, J=5.3 Hz, 2 H).

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