反应详情

温度

60 °C

Ethyl 3-isopropyl-1,2,4-oxadiazole-5-carboxylate (10.42 mmol, 1.919 g) was dissolved in EtOH (20 ml). Sodium hydroxide pellets (12.50 mmol, 0.500 g) were dissolved in cold water (10 ml) and solution slowly added. The resulting solution was heated at 60° C. for 1.5 h. EtOH was removed under vacuum. The residue was diluted with tert-butyl methyl ether. The mixture was acidified under cold conditions by adding 2 N HCl solution. The mixture was stirred overnight and washed with DCM. Water phase was evaporated precipitating the product. 1.673 g of the title compound was obtained. 1H-NMR (400 MHz, D2O): δ 1.33 (d, 6H), 3.10-3.25 (m, 1H).

1. additionsolution slowly added
2. customEtOH was removed under vacuum
3. additionThe residue was diluted with tert-butyl methyl ether
4. additionby adding 2 N HCl solution
5. washwashed with DCM
6. customWater phase was evaporated
7. customprecipitating the product