反应详情

To a 200 ml volume four-necked flask, tetrahydrofuran (anhydrous) (27.0 ml) and sodium hydride (1.90 g) were added under a nitrogen atmosphere at about 0° C., and stirred. Then, 1-[2-(2,6-diethyl-4-methylphenyl)-2-oxoacetyl]-1-methyl-2-(1-methylsulfanyl-2-propylidene)hydrazine ((4-4)-(1)-39) (14.2 g) dissolved in tetrahydrofuran (anhydrous) (45 ml) was added dropwise over 30 minutes, and then the mixture was stirred at 0° C. for 2 hours. Then, to the mixture was added water (100 ml) at room temperature, and extracted with tert-butyl methyl ether. The organic layer was concentrated under reduced pressure. The residue was subjected to column chromatography (hexane: ethyl acetate=4:1) to give 5.45 g of 4-(2,6-diethyl-4-methylphenyl)-2,6-dimethyl-5-methylsulfanyl-2,3-dihydro-3-pyridazinone.

1. additionwas added dropwise over 30 minutes
2. stirringthe mixture was stirred at 0° C. for 2 hours
3. extractionextracted with tert-butyl methyl ether
4. concentrationThe organic layer was concentrated under reduced pressure