Water → 2-Chloro-4-fluoro-5-(1-methyl-6-trifluoromethyl-2,4(1H,3H)-pyrimidinedion-3-yl)benzaldehyde (O-methyl)oxime

Participants

Reaction Conditions

Reaction Steps

First, 117.1 g (0.85 mol) of potassium carbonate were added to a solution of 281.6 g (0.77 mol) of 2-chloro-4-fluoro-5-(6-trifluoromethyl-2,4(1H,3H)-pyrimidinedion-3-yl)benzaldehyde (O-methyl)oxime in 0.8 l of dimethylformamide, whereupon a solution of 120.2 g of methyl iodide (0.85 mol) in 0.1 l of dimethylformamide was added dropwise in the course of 1 hour. The reaction mixture was subsequently stirred for 20 hours at approximately 20° C., and 0.9 l of water was subsequently added dropwise with ice-cooling. The product of value was extracted from the resulting solution using 1 l of dichloromethane. The extract was washed three times using 300 ml of water, dried over sodium sulfate and finally concentrated. Yield: 241 g; m.p.: 141-142° C. (diisopropyl ether).

Provenance & Evidence