反应详情

温度

0 °C

4-(Trifluoromethyl)benzene-1-carbothiamide (5.03 g, 24.5 mmol) was dissolved in 30 ml of EtOH and treated with 1.05 eq of 3-chloro-2,4-pentanedione (3.46 g, 25.7 mmol); the mixture was kept at 55-60° C. over night. Reducing the total volume to ˜¼ and cooling to 0° C. triggered crystallization. Filtration and washing with a tiny amount of cold EtOH afforded 5.49 g of 1-[4-methyl-2-(4-trifluoromethyl-phenyl)-thiazol-5-yl]-ethanone (79%) as yellow crystals of, MS: 285 (M+), MP: 89-90° C.

1. waitthe mixture was kept at 55-60° C. over night
2. customcrystallization
3. filtrationFiltration
4. washwashing with a tiny amount of cold EtOH