反应详情

An aqueous solution of 2% sodium hydroxide (3 ml) was added to a solution of 2-methyl-thiazole-5-carboxaldehyde (2.5 g) in acetone (20 ml) and water (10 ml). The mixture was stirred for 24 hours at ambient temperature, diluted with water (150 ml) and extracted with chloroform (2×50 ml). The organic layer was washed with water then dried over anhydrous magnesium sulphate and filtered. Evaporation of the solvent gave 1-(2-methyl-5-thiazolyl)but-1-en-3-one as a low-melting point solid (1.4 g, 43%). Pmr spectrum (CDCl3 ; δ in ppm): 2.30 (3H,s); 2.72 (3H,s); 6.36 (1H,d); 7.56 (1H,d); 7.74 (1H,s).

1. extractionextracted with chloroform (2×50 ml)
2. washThe organic layer was washed with water
3. dry with materialthen dried over anhydrous magnesium sulphate
4. filtrationfiltered
5. customEvaporation of the solvent