反应详情

Potassium bis(trimethylsilyl)amide (a 0.5M solution in toluene; 14.5 ml, 7.24 mmol) was added to a solution of dodecyltriphenylphosphonium bromide (1.82 g, 3.56 mmol) in tetrahydrofuran (10 ml) at -78° under argon. After one hour, methyl chloroformate (0.28 ml, 3.56 mmol) was added, followed by 5-trimethylsilyl-3-furaldehyde (300 mg, 1.78 mmol) after one hour. Stirring was continued overnight while the cooling bath attained room temperature. The mixture was quenched with methanol/water (30 ml, 1:1). Extraction (ethyl ether/hexane, 1:1) and evaporation of the dried (magnesium sulfate) extracts gave an oil, which was flash chromatographed on silica using 20% ethyl ether/hexane. The title ester was obtained as a pale yellow oil.

1. waitwas continued overnight while the cooling bath attained room temperature
2. customThe mixture was quenched with methanol/water (30 ml, 1:1)
3. extractionExtraction (ethyl ether/hexane, 1:1) and evaporation of the
4. dry with materialdried (magnesium sulfate)
5. customextracts gave an oil, which
6. customchromatographed on silica using 20% ethyl ether/hexane