Potassium Carbonate → HCID 86678196, compound

Participants

Reaction Steps

In THF (10 mL) was dissolved 2-bromo-5-(diethoxymethyl)pyridine (1.00 g, 3.84 mmol) obtained in Step 1. To the solution were added trimethylsilyl acetylene (1.09 mL, 7.69 mmol), copper iodide (I) (37.0 mg, 0.192 mmol), (bistriphenylphosphine) palladium (II) chloride (135 mg, 0.192 mmol), and triethylamine (1.07 mL, 7.69 mmol), and the mixture was stirred at 70° C. for 6 hours. The solvent in the reaction mixture was evaporated under reduced pressure, and water and ethyl acetate were added. The mixture was filtered through Celite and the filtrate was extracted with ethyl acetate. Washing with saturated brine and drying over anhydrous sodium sulfate were performed. After filtration, the solvent in the filtrate was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate=9/1) to give 5-(diethoxymethyl)-2-((trimethylsilyl)ethynyl)pyridine (1.07 g). In methanol (10 mL) was dissolved 5-(diethoxymethyl)-2-((trimethylsilyl)ethynyl)pyridine obtained. Potassium carbonate (1.06 g, 7.69 mmol) was added, and the mixture was stirred at room temperature for 1 hour. The solvent in the reaction mixture was evaporated under reduced pressure, and water was added. Extraction with ethyl acetate, washing with saturated brine and drying over anhydrous sodium sulfate were performed. After filtration, the solvent in the filtrate was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate=4/1) to give 5-(diethoxymethyl)-2-ethynylpyridine (703 mg, 89% yield).

Provenance & Evidence