反应详情

0.586 g of potassium hydroxide is added to 1.4 g of 2-hydroxy-1-methoxy-5-methyl-3-(2-methyl-6-trifluoromethyl-pyridine-3-carbonyl)-4-oxo-cyclohex-2-enecarboxylic acid methyl ester in dioxane/water (5:3) and the batch is stirred for 3 hours. The batch is then acidified (pH 3) and extracted with fresh ethyl acetate. The crude product is purified by chromatography analogously to Example P7. 3-Hydroxy-4-methoxy-6-methyl-2-(2-methyl-6-trifluoromethyl-pyridine-3-carbonyl)-cyclohex-2-enone is obtained in the form of a viscous oil (as a mixture of 3 tautomeric forms, according to 1H-NMR).

1. extractionextracted with fresh ethyl acetate
2. customThe crude product is purified by chromatography analogously to Example P7