反应详情

A solution of 2,4-dimethylthiazole-5-carboxaldehyde (2.0 g) and 1-triphenylphosphoranylidene-2-propanone (8.2 g) in dimethylsulphoxide (140 ml) was stirred at ambient temperature for 24 hr. The solution was poured into water (400 ml) and extracted with dichloromethane. The dried (Na2SO4) organic extract was evaporated and the residue was purified by column chromatography over silica with ethyl acetate/n-hexane (1:1 v/v) elution to give 1-(2,4-dimethyl-5-thiazolyl)but-1-en-3-one (2.1 g). Pmr spectrum (CDCl3 ; δ in ppm): 2.32 (3H, s); 2.49 (3H, s); 2.67 (3H, s); 6.30 (1H, d); 7.60 (1H, d).

1. extractionextracted with dichloromethane
2. dry with materialThe dried (Na2SO4)
3. extractionorganic extract
4. customwas evaporated
5. customthe residue was purified by column chromatography over silica with ethyl acetate/n-hexane (1:1 v/v) elution