反应详情

2.23 g of fresh 2-methyl-6-trifluoromethyl-nicotinoyl chloride are added to a mixture of 2.14 g of 2-hydroxy-1-methoxy-5-methyl-4-oxo-cyclohex-2-ene-carboxylic acid methyl ester and 2.02 g of triethylamine in 30 ml of acetonitrile. After about 30 minutes, 0.065 g of potassium cyanide is added and the batch is stirred for 18 hours. The batch is then extracted at pH 2 with water against ethyl acetate, dried over magnesium sulfate and concentrated by evaporation. By filtering over silica gel (mobile phase: ethyl acetate/methanol/triethylamine 85:10:5), pure 2-hydroxy-1-methoxy-5-methyl-3-(2-methyl-6-trifluoromethyl-pyridine-3-carbonyl)-4-oxo-cyclohex-2-enecarboxylic acid methyl ester is obtained in the form of a viscous oil.

1. extractionThe batch is then extracted at pH 2 with water against ethyl acetate
2. dry with materialdried over magnesium sulfate
3. concentrationconcentrated by evaporation
4. filtrationBy filtering over silica gel (mobile phase: ethyl acetate/methanol/triethylamine 85:10:5)