反应详情

To a solution of aldehyde 201 (180 mg, 0.75 mmol) in THF (10 mL), stirred at 0° C. under nitrogen, was added triethyl-4-phosphonocrotonate (220 μL, 0.98 mmol) followed by sodium hydride (40 mg, 0.98 mmol). The mixture was allowed to warm up to room temperature in 2 hours and then quenched by adding water, and extracted with ethyl acetate. The combined organic layers were washed with brine, dried (MgSO4) and concentrated. Purification by flash silica gel chromatography (30% ethyl acetate in hexane) afforded the corresponding diene 202 (100 mg, 40% yield). MS (ESI)=335 (MH+).

1. customquenched
2. additionby adding water
3. extractionextracted with ethyl acetate
4. washThe combined organic layers were washed with brine
5. dry with materialdried (MgSO4)
6. concentrationconcentrated
7. customPurification by flash silica gel chromatography (30% ethyl acetate in hexane)