Water → 3-[4-methoxymethyl-1-(2-trimethylsilanyl-ethoxymethyl)-1H-benzoimidazol-2-yl]-5-(4-methyl-pyridin-3-yl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrazolo[3,4-b]pyridine

Participants

Reaction Conditions

Reaction Steps

An aqueous 2M sodium carbonate solution (0.11 mL, 0.23 mmol) was added to a solution of 3-[4-methoxymethyl-1-(2-trimethylsilanyl-ethoxymethyl)-1H-benzoimidazol-2-yl]-5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrazolo[3,4-b]pyridine Compound 12c (60 mg, 0.09 mmol), 3-bromo-4-methyl-pyridine Compound 13a (10 μl, 0.09 mmol) and tetrakis(triphenylphosphine)palladium(0) (16 mg, 0.01 mmol) in dioxane (1 mL) in a reaction tube. The reaction tube was sealed and heated to 90° C. overnight. After cooling to room temperature, the crude mixture was poured into water (30 mL) and was extract with DCM (2×25 mL). The combined organic layer was dried over sodium sulfate and concentrated. Silica gel chromatography (10% to 50% ethyl acetate/hexanes) gave 3-[4-methoxymethyl-1-(2-trimethylsilanyl-ethoxymethyl)-1H-benzoimidazol-2-yl]-5-(4-methyl-pyridin-3-yl)-1-(2-trimethylsilanyl-ethoxymethyl)-1H-pyrazolo[3,4-b]pyridine Compound 13b (54 mg, 95%) as a white solid. 1H NMR (300 MHz, CD3OD) δ 9.17 (d, 1H, J=1.5 Hz), 8.92 (d, 1H, J=1.5 Hz), 8.71 (m, 2H), 7.87 (m, 2H), 7.61 (m, 2H), 6.50 (s, 2H), 6.23 (s, 2H), 5.17 (s, 2H), 4.04 (t, 2H, J=6 Hz), 3.86 (t, 2H, J=6 Hz), 3.66 (s, 3H), 2.62 (s, 3H), 1.18 (t, 2H, J=6 Hz); 1.05 (t, 2H, J=6 Hz), 0.18 (s, 9H), 0.05 (s, 9H); MS (ESI) m/z: 631 (M+H+).

Provenance & Evidence