反应详情

A suspension of [4-(2-ethoxy-2-oxoethoxy)-3-methylbenzyl](triphenyl)phosphonium chloride (500 mg, 0.99 mmol) in dry THF (10 mL) was cooled to 0° C. (ice/water bath) and treated with NaH (44 mg of a 60% dispersion in mineral oil, 1.10 mmol) portion-wise over 5 minutes. The resulting yellow suspension was stirred for 15 minutes and was then treated with 3-bromobenzaldehyde (184 mg, 0.99 mmol) in dry THF (5 mL). The resulting white suspension was allowed to warm to rt over 3.5 hours and was then heated at reflux for 1 hour. The reaction mixture was then allowed to cool to rt, stirred overnight and was then reduced under vacuum. The residue was then partitioned between CHCl3 (20 mL) and water (20 mL) and the layers separated. The cloudy organic layer was dried through a hydrophobic frit and then concentrated to a cream coloured gum (700 mg). Purification by SPE (silica) eluting with cyclohexane:EtOAc (9:1) afforded the title compound (mixture of E:Z isomers) (258 mg).

1. temperaturewas then heated
2. temperatureat reflux for 1 hour
3. temperatureto cool to rt
4. stirringstirred overnight
5. customThe residue was then partitioned between CHCl3 (20 mL) and water (20 mL)
6. customthe layers separated
7. customThe cloudy organic layer was dried through a hydrophobic frit
8. concentrationconcentrated to a cream coloured gum (700 mg)
9. customPurification by SPE (silica)
10. washeluting with cyclohexane:EtOAc (9:1)