反应详情

温度

20 °C

To 50.46 g (0.234 mmol) of pyridinium chlorochromate, under argon, was added 100 mL of dichloromethane followed, with rapid stirring, by 25.0 g (0.156 mmol) of methyl 2-ethyl-5-hydroxypentanoate in 20 mL of dichloromethane. After stirring at 20° C. for 2.5 h, 15 g of silica gel was added followed by 200 mL of ether. Filtration through a 3.5×40 cm silica gel column (60-200 mesh), eluting with ether and concentration at 40° C. under vacuum gave an oil, which was redissolved in 100 mL of dichloromethane. Washing with 3×100 mL of cold 1N HCl, 3×100 mL of satd. NaHCO3, drying over MgSO4, filtration, concentration at 40° C. and distillation gave methyl 2-ethyl-5-oxopentanoate 14.64 g (59%) product, b.p 104°-105° C. (16 mm Hg).

1. addition15 g of silica gel was added
2. filtrationFiltration through a 3.5×40 cm silica gel column (60-200 mesh)
3. washeluting with ether and concentration at 40° C. under vacuum
4. customgave an oil, which
5. washWashing with 3×100 mL of cold 1N HCl, 3×100 mL of satd
6. dry with materialNaHCO3, drying over MgSO4, filtration, concentration at 40° C.
7. distillationdistillation