反应详情

A solution of 2-methoxy-4,4-dimethyl-cyclohex-2-enone (12.5 g, 81.1 mmol) and diethyl oxalate (12.1 mL, 89.2 mmol) in ethyl ether was treated with a 1 M solution of lithium bis(trimethylsilyl)amide in tetrahydrofuran under argon atmosphere. The reaction was stirred at room temperature for 2 hours, poured into a 10% NaH2PO4 solution (500 mL) and extracted with diethyl ether (300 mL×2). The organic extracts were washed with brine, dried on Na2SO4 and evaporated to dryness. The crude material was taken up with hexane, stirred and filtered to give the title compound (16.8 g, 81.5% yield) as a yellow crystalline solid.

1. extractionextracted with diethyl ether (300 mL×2)
2. washThe organic extracts were washed with brine
3. customdried on Na2SO4
4. customevaporated to dryness
5. stirringstirred
6. filtrationfiltered