反应详情

温度

50 °C

To a solution of (5S)-5-(1-hydroxypropyl)tetrahydrofuran-2-one (compound 28d, 9 g, 62.5 mmol) in DMF (100 mL) was added tert-butylchlorodiphenylsilane (42.8 g, 156 mmol) and imidazole (10.6 g, 156 mmol) under N2. After being stirred at 50° C. for 12 hours, the mixture was diluted with water and extracted with EtOAc. The combined organic layers were washed with brine (100 mL) and concentrated in vacuo. The residue was purified by column chromatography on silica gel (eluting with 1:20 to 1:3 EtOAc in petroleum ether) to afford 18 g of (5S)-5-[(1-[tert-butyl(diphenyl)silyl]oxypropyl]tetrahydrofuran-2-one. 10 g of the mixture was further purified and separated by SFC to afford 5.6 g of (5S)-5-[(1S)-1-[tert-butyl(diphenyl)silyl]oxypropyl]tetrahydrofuran-2-one (compound 28e-S) and 2 g of (5S)-5-[(1R)-1-[tert-butyl(diphenyl)silyl]oxypropyl]tetrahydrofuran-2-one (compound 28e-R). (Refer to Tetrahedron. 1997, 53, 6281-6294).

1. extractionextracted with EtOAc
2. washThe combined organic layers were washed with brine (100 mL)
3. concentrationconcentrated in vacuo
4. customThe residue was purified by column chromatography on silica gel (eluting with 1:20 to 1:3 EtOAc in petroleum ether)