反应详情

A mixture of 0.50 g of 3-acetyl-4-hydroxy-6-methyl-2(1H)-pyridinone, 0.74 g of 3-chloro-4-(trifluoromethoxy)benzaldehyde, 6 mg of pyridine and 0.1 ml of piperidine was heated under refluxing for 4 hours. After cooled to room temperature, 40 ml of water was added to the reaction mixture, precipitated crystals were filtered, and this was washed with tetrahydrofuran, then with ethyl acetate to obtain 0.41 g of 4-hydroxy-3-[3-[3-chloro-4-(trifluoromethoxy)phenyl]-1-oxo-2-propenyl]-6-methyl-2(1H)-pyridinone [Compound No. (3a-32)] as a yellow crystal.

1. temperaturewas heated
2. temperatureunder refluxing for 4 hours
3. customprecipitated crystals
4. filtrationwere filtered
5. washthis was washed with tetrahydrofuran