反应详情

温度

-20 °C

Dissolve trans-2-methyl-cyclohexanol (5.0 g, 44.0 mmol) in anhydrous THF (500 mL) and cool to −20° C. Add triphenylphosphine (57.43 g, 218.9 mmol), diethyl azodicarboxylate (38.13 g, 218.9 mmol), and diphenylphosphoryl azide (60.25 g, 218.9 mmol) respectively under nitrogen. Stir the reaction mixture for 6 hours at the same temperature then warm it to room temperature and stir overnight Add water (500 mL), and extract the aqueous layer with EtOAc (3×500 mL). Combine the organic layers and dry with Na2SO4, filter, concentrate and purify by flash column chromatography (silica gel, 0-25% of EtOAc/Hexane) to give 3.98 g (65%) of the title compound as a colorless oil: 1H NMR (CDCl3) δ 3.08-3.16 (m, 1H), 1.90-1.98 (m, 1H), 1.56-1.78 (m, 3H), 1.16-1.35 (m, 4H), 1.01 (d, 3H), 0.93-1.03 (m, 1H).

1. temperaturethen warm it to room temperature
2. stirringstir overnight
3. extractionextract the aqueous layer with EtOAc (3×500 mL)
4. dry with materialCombine the organic layers and dry with Na2SO4
5. filtrationfilter
6. concentrationconcentrate
7. custompurify by flash column chromatography (silica gel, 0-25% of EtOAc/Hexane)