Water → 5-[(Trimethylsilyl)ethynyl]thiophen-2-ylmethyl Tert-butyldiphenylsilyl Ether

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Reaction Steps

A round bottom flask was flame-dried under high vacuum. The vacuum was broken by the addition of dry argon, and the flask was allowed to cool to room temperature. The flask was charged with 2.16 g (5.0 mmol) of (5-bromothiophen-2-yl)methyl tert-butyldiphenylsilyl ether (Compound 12), 2.12 mL (15 mmol) of (trimethylsilyl)acetylene, and 17.5 mL of triethylamine. The solution was purged with argon for 15 min and bis(triphenylphosphine)palladium (II) chloride (88 mg, 0.125 mmol) and copper (I) iodide (24 mg, 0.125 mmol) were added and the solution stirred at ambient temperature for 3 days. The solution was poured into a separatory funnel containing water and ether. The layers were separated and the aqueous layer was extracted 3 times with ether. The combined ether layers were washed once with brine, and dried over magnesium sulfate, and the solvents were removed under reduced pressure. The residue was purified by silica gel chromatography (hexane) to give the title compound.

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