反应 #67526

反应方程式

water

N-α-CBZ-glycine

bromoacetaldehyde dimethyl acetal

Cs2CO3

→

product 37

收率 61.2%

2,2-dimethoxyethyl N-benzyloxycarbonylglycine

收率 61.2%

溶剂

DMF

反应条件

后处理

1. 1
   温度After cooling to room temperature
2. 2
   萃取the mixture was extracted with ethyl acetate (3×80 mL)
3. 3
   干燥dried over Na2SO4
4. 4
   过滤filtered
5. 5
   浓缩concentrated in vacuo
6. 6
   其他The residue was purified by flash chromatography on silica gel using 45-50% ethyl acetate/hexanes

实验过程

A mixture of N-α-CBZ-glycine (2.0 g, 9.57 mmol), bromoacetaldehyde dimethyl acetal (2.25 mL, 19.13 mmol) and Cs2CO3 (2.78 g, 3.12 mmol) in 20 mL of anhydrous DMF was stirred at 100° C. for 24 h. After cooling to room temperature, water was added and the mixture was extracted with ethyl acetate (3×80 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by flash chromatography on silica gel using 45-50% ethyl acetate/hexanes to give the product 37 (1.74 g, 61%). 1H NMR (400 MHz, CDCl3) δ 3.38 (s, 6H), 3.98 (d, J=5.7 Hz, 2H), 4.12 (d, J=5.3 Hz, 2H), 4.54 (t, J=5.3 Hz, 1H), 5.10 (s, 2H), 5.50 (bs, 1H), 7.32 (m, 5H).

来源