反应详情

Methyl 4-(3,5-dimethyl-2-formyl-4-methoxyphenyl)butyrate (9.4 g) and 1-triphenylphosphoranylidene-2-propanone (21 g equiv) were heated and stirred at reflux in toluene for 48 hr. The solvent was evaporated under reduced pressure and the residue was purified by column chromatography over silica with dichloromethane elution to give methyl 4-[2-(but-1-en-3-one-1-yl)-3,5-dimethyl-4-methoxyphenyl]butyrate as a pale yellow oil. Pmr spectrum (CDCl3 ; δ in ppm): 1.83-2.69 (6H,m); 2.25 (3H,s); 2.28 (3H,s); 2.41 (3H,s); 3.66 (3H,s); 3.70 (3H,s); 6.26 (1H,d); 6.89 (1H,s); 7.65 (1H,d).

1. customThe solvent was evaporated under reduced pressure
2. customthe residue was purified by column chromatography over silica with dichloromethane elution