Dimethyl Sulfoxide → Bicyclo[2.2.1]heptane-2-carbaldehyde

関与物質

反応条件

反応手順

In a flask under argon was placed dichloromethane (25 mL) and to this was added a 2M solution of oxalyl chloride in dichloromethane (4.0 mL, 8.0 mmol). The mixture was then cooled to −78° C. and then slowly treated with dimethyl sulfoxide (846 μL, 11.92 mmol) and gas evolution occurred. The mixture was stirred at −78° C. for 20 min. After this time, a solution of bicyclo[2.2.1]hept-2-yl-methanol (505 mg, 4.0 mmol) in dichloromethane (15 mL) was added dropwise. The mixture was stirred at −78° C. for another 15 min and then triethylamine (2.2 mL, 15.6 mmol) was added and the reaction was slowly warmed to 0° C. The mixture was then quenched with a 1M aqueous sodium bisulfate solution (50 mL) and extracted with dichloromethane (3×20 mL). The organic layers were combined and dried over magnesium sulfate, filtered and concentrated in vacuo. Purification by AnaLogix IntelliFlash flash chromatography (12 g column, 3% ethyl acetate/hexanes to 40% ethyl acetate/hexanes) afforded slightly impure bicyclo[2.2.1]heptane-2-carbaldehyde (512 mg).

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