反应详情

Dimethyl sulphate (0.65 ml, 6.9 mmol) was added dropwise to a mixture of (E)-methyl 2-[2-(6-trifluoromethylpyrid-2-yloxymethyl)phenyl]-3-hydroxyacrylate (2.12 g, 6 mmol) and anhydrous potassium carbonate (1.2 g, 8.7 mmol) in dry DMF (10 ml). After stirring at room temperature for 6 hours, the mixture was poured into water and extracted with diethyl ether. The ether extracts were washed with water, dried and concentrated to give a crude product which was purified by column chromatography (silica eluted with 20% ethyl acetate in hexane) to give (E)-methyl 2-[2-(6-trifluoromethylpyrid-2-yloxymethyl)phenyl]-3-methoxyacrylate (Compound No.177 in Table I of EP-A-0278595); (1.01 g, 46%) as a cream solid; mp 73-74° C.; 1H NMR (270 MHz)δ: 3.68(3H,s), 3.82(3H,s), 5.34(2H,s), 6.87(1H,d), 7.15-7.70(6H,m), 7.55(1H,s) ppm.

1. extractionextracted with diethyl ether
2. washThe ether extracts were washed with water
3. customdried
4. concentrationconcentrated
5. customto give a crude product which
6. customwas purified by column chromatography (silica eluted with 20% ethyl acetate in hexane)