反应详情

温度

-40 °C

To a solution of 1-methyl-4-nitro-1H-pyrazole (1.5 g, 11.8 mmol) and (Z)-cyclohept-4-enone (1.4 g, 13.0 mmol) in dry THF (30 mL) under nitrogen cooled to −78° C. was added dropwise a solution of lithium hexamethyldisilazide (1.0 M in THF, 30 mL, 29.5 mmol). The reaction mixture was allowed to warm to −40° C. and stirred for 90 min. Saturated aqueous ammonium chloride solution (30 mL) was added (dropwise initially) and the mixture was allowed to warm to room temperature and extracted with EtOAc (150 mL). The organic layer was washed with water (30 mL), washed with brine (20 mL), separated, dried over MgSO4 and concentrated under reduced pressure. Purification via silica gel column chromatography (20-25% EtOAc) gave (Z)-1-(1-methyl-4-nitro-1H-pyrazol-5-yl)cyclohept-4-enol as a tan oil (1.37 g, 49%).

1. temperatureto warm to room temperature
2. extractionextracted with EtOAc (150 mL)
3. washThe organic layer was washed with water (30 mL)
4. washwashed with brine (20 mL)
5. customseparated
6. dry with materialdried over MgSO4
7. concentrationconcentrated under reduced pressure
8. customPurification via silica gel column chromatography (20-25% EtOAc)