反应详情

温度

-78 °C

To a cooled solution of (5S)-5-[[tert-butyl(diphenyl)silyl]oxymethyl]tetrahydrofuran-2-one (compound 40d, 5.00 g, 14.0 mmol) in dry tetrahydrofuran (28 mL) was added a solution of lithium bis(trimethylsilyl)azanide (1.3 M in THF, 11.8 mL, 15.4 mmol) dropwise at −78° C. under argon. After addition, the mixture was stirred at −78° C. for 1 hour. Then distilled acetone (1.23 mL, 15.4 mmol) was added dropwise to the mixture and the resulting mixture was stirred at −78° C. for another 2 hours. The reaction was quenched by saturated NH4Cl solution and extracted with EtOAc (30 mL) three times. The combined organic layers were dried over Na2SO4 and concentrated in vacuo. The residue was purified by column chromatography on silica gel (eluting with 0-30% EtOAc in petroleum ether) to afford 5.7 g of (3S,5S)-5-[[tert-butyl(diphenyl)silyl]oxymethyl]-3-(1-hydroxy-1-methyl-ethyl)tetrahydrofuran-2-one (compound 40e) as a light yellow oil. MS obsd. (ESI+) [(M+NH4)+]: 430. (For the synthesis, please refer to: Tetrahedron 1997, 53, 6281-6294).

1. additionAfter addition
2. stirringthe resulting mixture was stirred at −78° C. for another 2 hours
3. customThe reaction was quenched by saturated NH4Cl solution
4. extractionextracted with EtOAc (30 mL) three times
5. dry with materialThe combined organic layers were dried over Na2SO4
6. concentrationconcentrated in vacuo
7. customThe residue was purified by column chromatography on silica gel (eluting with 0-30% EtOAc in petroleum ether)