反应详情

3-Benzyloxy-2-methyl-4-pyrone (4.8 g), prepared as described under Example 10, and 2-hydroxyethylamine (1.22 g) are dissolved in water (220 ml) and ethanol (100 ml) containing sodium hydroxide (2 g) is added. The mixture is stirred at room temperature for 6 days and is then acidified with concentrated hydrochloric acid to pH 2, and evaporated to dryness. The resulting colourless solid is washed with water and extracted into chloroform (2×50 ml). The chloroform extracts are combined, dried over magnesium sulphate, and evaporated to yield 3-benzyloxy-1-(2'-hydroxyethyl)-2-methylpyrid-4-one, as a white solid (3.4 g), m.p. 198°-199° C.

1. additionis added
2. customevaporated to dryness
3. washThe resulting colourless solid is washed with water
4. extractionextracted into chloroform (2×50 ml)
5. dry with materialdried over magnesium sulphate
6. customevaporated