反应详情

温度

0 °C

55.9 g (326.1 mmol) of 2-bromopropionic acid chloride is added in drops at 0° C. to 100 g (296.4 mmol) of glycine benzyl ester-p-toluenesulfonic acid salt and 33.0 g (326.1 mmol) of triethylamine in 400 ml of methylene chloride. The temperature is not allowed to exceed 5° C. After addition is completed, it is stirred for one hour at 0° C., then for 2 hours at room temperature. 500 ml of ice water is added, and the water phase is set at pH 2 with 10% aqueous hydrochloric acid. The organic phase is separated, washed once each with 300 ml of 5% aqueous soda solution and 400 ml of water. The organic phase is dried on magnesium sulfate and evaporated to dryness in a vacuum. The residue recrystallizes from diisopropyl ether.

1. customto exceed 5° C
2. additionAfter addition
3. waitfor 2 hours at room temperature
4. customThe organic phase is separated
5. washwashed once each with 300 ml of 5% aqueous soda solution and 400 ml of water
6. customThe organic phase is dried on magnesium sulfate
7. customevaporated to dryness in a vacuum
8. customThe residue recrystallizes from diisopropyl ether