Sodium hydride → 5-Chloro-7-[1,1-dimethyl-2-(2-trifluoromethyloxiranyl)ethyl]-2,3-dihydrobenzofuran

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Reaction Steps

To a solution of trimethylsulfoxonium iodide (343 mg, 1.56 mmol) in 3 mL of anhydrous DMSO was treated with NaH (60% in mineral oil, 66.0 mg, 1.65 mmol) in portions and the mixture was stirred at room temperature for 30 minutes. The mixture was transferred to a solution of 4-(5-chloro-2,3-dihydrobenzofuran-7-yl)-1,1,1-trifluoro-4-methylpentan-2-one (400 mg, 1.30 mmol) in 1 mL of anhydrous DMSO over 5 minutes and the resulting mixture was stirred overnight. The mixture was quenched with water and extracted with three 20 mL portions of ethyl acetate. The combined organic layers were washed with two 5 mL portions of water, dried over magnesium sulfate, filtered, and concentrated in vacuo to afford 380 mg (91% yield) of the title product as a yellow oil. The crude product was sufficiently pure and used without further purification.

Provenance & Evidence