反应详情

温度

100 °C

((1S,4R)-7,7-Dimethyl-2-oxobicyclo[2.2.1]heptan-1-yl)methanesulfonic acid (1.07 g, 4.62 mmol) and paraformaldehyde (847 mg, 2.89 mmol) were added to a solution of dicyclohexylamine (R)-2-((tert-butoxycarbonyl)amino)-3-(ethyldisulfanyl)propanoate (Compound 2d-f) (2.00 g, 4.32 mmol) in toluene (8 ml), and the mixture was stirred at 100° C. overnight. The reaction solution was then returned to room temperature and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (hexane/ethyl acetate=100/0→87/13) to afford (R)-tert-butyl 4-((ethyldisulfanyl)methyl)-5-oxooxazolidine-3-carboxylate (2e-F) (847 mg, 67%).

1. customwas then returned to room temperature
2. concentrationconcentrated under reduced pressure
3. customThe resulting residue was purified by silica gel column chromatography (hexane/ethyl acetate=100/0→87/13)