Potassium Carbonate → 1-(3-Methoxy-4-((6-methoxypyridin-3-yl)methoxy)benzyl)-5-(4-(piperidin-3-yl)-1H-1,2,3-triazol-1-yl)-1H-benzo[d]imidazole

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Reaction Steps

To a suspension of 5-iodo-1-(3-methoxy-4-((6-methoxypyridin-3-yl)methoxy)benzyl)-1H-benzo[d]imidazole (0.32 g, 0.63 mmol) in dimethyl sulfoxide (4 mL) and water (1 mL) was added 3-ethynylpiperidine hydrochloride (0.11 g, 0.75 mmol), sodium azide (0.051 g, 0.79 mmol), L-ascorbic acid sodium salt (0.025 g, 0.13 mmol), trans-N,N-dimethylcyclohexane-1,2-diamine (0.023 mg, 0.158 mmol), potassium carbonate (0.13 g, 0.95 mmol), and copper(I) iodide (0.024 g, 0.13 mmol). The resulting blue mixture was allowed to stir at room temperature. After 16 h, the yellow mixture was diluted with 5N ammonium hydroxide solution and extracted with chloroform (2×30 mL). The combined organic phases were dried over magnesium sulfate, filtered, and concentrated to provide 0.53 g of a yellow oil. Chromatographic purification (Combi-Flash, 24 g SiO2 gold column, 1-10% 2M ammonia in methanol/dichloromethane elute) afforded 0.15 g (45%) of the product as a white foamy solid: 1H NMR (400 MHz, DMSO-d6) δ 8.61-8.53 (m, 2H), 8.20 (d, J=2.4 Hz, 1H), 8.11 (d, J=1.9 Hz, 1H), 7.79-7.71 (m, 3H), 7.12 (d, J=1.9 Hz, 1H), 7.03 (d, J=8.2 Hz, 1H), 6.89-6.80 (m, 2H), 5.46 (s, 2H), 4.97 (s, 2H), 3.84 (s, 3H), 3.73 (s, 3H), 3.25-3.16 (m, 1H), 3.01-2.91 (m, 1H), 2.90-2.80 (m, 1H), 2.68-2.51 (m, 2H), 2.12-2.03 (m, 1H), 1.72-1.44 (m, 3H) ppm; (M+1)=526.

Provenance & Evidence