反应详情

温度

110 °C

41.4 mmoles of methyl 2-bromo-2-methyl-propionate and 4.56 mmoles of thiourea are dissolved in n-butanol (90 mL) and stirred at 110° C. for 5 hours. The solvent is evaporated to dryness and the residue is taken up in ethanol (120 ml) and HCl (2N, 120 mL) and then heated at reflux for 16 hours. The ethanol is evaporated off and the mixture is diluted with water (120 ml) and then extracted with AcOEt. The organic phase is washed with saturated NaCl solution, dried over magnesium sulphate, filtered and evaporated to dryness. The crystals obtained are washed with pentane, filtered off and dried in vacuo to yield the title product.

1. customThe solvent is evaporated to dryness
2. temperatureHCl (2N, 120 mL) and then heated
3. temperatureat reflux for 16 hours
4. customThe ethanol is evaporated off
5. additionthe mixture is diluted with water (120 ml)
6. extractionextracted with AcOEt
7. washThe organic phase is washed with saturated NaCl solution
8. dry with materialdried over magnesium sulphate
9. filtrationfiltered
10. customevaporated to dryness
11. customThe crystals obtained
12. washare washed with pentane
13. filtrationfiltered off
14. customdried in vacuo