反应详情

温度

95 °C

A mixture of 2,6-dichloro-4-methyl-pyridine-3-carboxylic acid ethyl ester (29.7 g, 127 mmol), potassium carbonate (26.3 g, 190 mmol), and morpholine (13.3 g, 152 mmol) in dimethylformamide (350 ml) is stirred for 18 h at 95° C. After completion of the reaction, water is added and the mixture is extracted with diethyl ether (3×). The combined organic layers are washed with water (2×) and brine (1×), dried over magnesium sulphate and evaporated to dryness. The crude product is purified by flash chromatography (silica gel, 25% ethyl acetate/cyclohexane) to yield 2-chloro-4-methyl-6-morpholin-4-yl-pyridine-3-carboxylic acid ethyl ester (10.5 g, 36.9 mmol, 29%).

1. additionis added
2. extractionthe mixture is extracted with diethyl ether (3×)
3. washThe combined organic layers are washed with water (2×) and brine (1×)
4. dry with materialdried over magnesium sulphate
5. customevaporated to dryness
6. customThe crude product is purified by flash chromatography (silica gel, 25% ethyl acetate/cyclohexane)