反应详情

18.4 g of diacetyl monoxime and 29.6 g of 4(2-propyl)-benzaldehyde are added to 50 ml of glacial acetic acid, and HCl gas is introduced with ice-cooling for 30 minutes. The product is precipitated as the hydrochloride by addition of methyl tert-butyl ether and filtered off with suction, and the precipitate is washed with methyl tert-butyl ether. The precipitate is suspended in a mixture of dichloromethane and water, and a basic pH is established using ammonia. The mixture is extracted three times with, in each case, 500 ml of dichloromethane and ethyl acetate, the combined organic phases are dried over MgSO4 and the solvent is then removed under reduced pressure. This gives 38.2 g 4,5-dimethyl-2-(4-(2-propyl)-phenyl)-oxazole 3-oxide as a yellowish solid.

1. additionis introduced with ice-
2. temperaturecooling for 30 minutes
3. customThe product is precipitated as the hydrochloride by addition of methyl tert-butyl ether
4. filtrationfiltered off with suction
5. washthe precipitate is washed with methyl tert-butyl ether
6. additionThe precipitate is suspended in a mixture of dichloromethane and water
7. extractionThe mixture is extracted three times with, in each case, 500 ml of dichloromethane and ethyl acetate
8. dry with materialthe combined organic phases are dried over MgSO4
9. customthe solvent is then removed under reduced pressure