[CH3:1][C:2](=[CH2:10])[CH2:3][C:4](=[N:8][OH:9])[C:5](=[O:7])[CH3:6].[C:11](=O)([O-])[O-].[K+].[K+].S(OC)(OC)(=O)=O>CC(C)=O>[CH3:11][O:9][N:8]=[C:4]([CH2:3][C:2]([CH3:1])=[CH2:10])[C:5](=[O:7])[CH3:6]141 g of 5-methylhex-5-ene-2,3-dione 3-oxime from Example 1 were dissolved in 750 ml of acetone and admixed with 165.6 g of potassium carbonate. 145 g of dimethyl sulfate in 100 ml of acetone were then added dropwise, and the mixture was stirred at 23° C. for 4 hours. The solvent was subsequently removed under reduced pressure, the residue was taken up with methyl tert-butyl ether/water and the aqueous phase was extracted repeatedly with methyl tert-butyl ether. The combined organic phases were washed with 15% strength ammonia solution and water and dried over sodium sulfate, and the solvent was removed under reduced pressure. This gave 141 g of the title compound as a yellow oil.
Wird geladen…
