反应详情

In a round-bottomed flask equipped with a stirrer and a condensor, 12.8 g (0.1 mole) of 2,5-dimethyl-4-hydroxy-3-(2H)-furanone and 44 g (1.0 mole) of acetaldehyde were introduced into a solution of 3.0 g of oxalic acid in 100 ml of water. The mixture was stirred and refluxed for 1 hour. After cooling, the mixture was extracted 5 times with 25 ml portions of chloroform and the organic solvent was evaporated off. The residue was purified by chromatography on 50 g of polyamide. After elution by means of a 50/50 mixture of ether and petroleum ether, 9.4 g of the title compound was obtained (which corresponds to a yield of 54%). Recrystallization from ether gave the pure product with m.p. 112-114°C).

1. customIn a round-bottomed flask equipped with a stirrer
2. temperaturerefluxed for 1 hour
3. temperatureAfter cooling
4. extractionthe mixture was extracted 5 times with 25 ml portions of chloroform
5. customthe organic solvent was evaporated off
6. customThe residue was purified by chromatography on 50 g of polyamide
7. washAfter elution
8. additionby means of a 50/50 mixture of ether and petroleum ether