反应详情

Sodium hydride (18.1 mmol, 543 mg of an 80% dispersion in mineral oil) was washed with 2×5 mL of petroleum ether under nitrogen, then it was dried and trimethylsulfoxonium iodide (3.99 g, 18.1 mmol) was added to the flask followed by 21.6 mL dimethylsulfoxide added dropwise. Next, a solution of 6-oxo-1-cyclohexeneacetic acid ethyl ester (2.90 g, 17.3 mmol) was added dropwise as a solution in 4.5 mL of dimethylsulfoxide as the reaction mixture was cooled with a water bath. After the addition, the reaction mixture was stirred at room temperature for 1.5 hours then poured into 80 mL of cold water and extracted with 4×60 mL of ether. The extracts were combined, washed with 80 mL of brine, dried over magnesium sulfate and concentrated affording 2.4 g (13.2 mmol, 73% yield) of the title compound as a yellow oil.

1. washSodium hydride (18.1 mmol, 543 mg of an 80% dispersion in mineral oil) was washed with 2×5 mL of petroleum ether under nitrogen
2. customit was dried
3. additionadded dropwise
4. temperaturewas cooled with a water bath
5. additionAfter the addition
6. extractionextracted with 4×60 mL of ether
7. washwashed with 80 mL of brine
8. dry with materialdried over magnesium sulfate
9. concentrationconcentrated