反应 #40290

反应方程式

Nvoc-Cl

NaOH

3-Amino-butyric acid

water

NaOH

→

3-(4,5-dimethoxy-2-nitrobenzyloxycarbonylamino)-butyric acid

收率 36.0%

溶剂

dioxane

反应条件

后处理

1. 1
   其他The cooling bath was removed
2. 2
   workup.WAITthe reaction mixture was left at room temperature o/n
3. 3
   workup.ADDITIONWater (30 mL) was added
4. 4
   过滤the mixture was filtered
5. 5
   萃取extracted with diethyl ether (3×50 mL)
6. 6
   workup.DISSOLUTIONThe solid was dissolved in water (50 mL)
7. 7
   干燥The combined organic phases were dried over MgSO4
8. 8
   其他evaporated in vacuo

实验过程

3-Amino-butyric acid (147 mg, 1.43 mmol) was mixed with water (10 mL), dioxane (10 mL) and 2 M NaOH (10 mL). The mixture was cooled to 0° C. and treated with Nvoc-Cl (1.58 mmol). 2 M NaOH was added in small portions (8×1.25 mL) during 75 minutes. The cooling bath was removed and the reaction mixture was left at room temperature o/n. Water (30 mL) was added and the mixture was filtered. The aqueous phase was adjusted to pH=4 with 2 M HCl (aq.) and extracted with diethyl ether (3×50 mL). The solid was dissolved in water (50 mL) and diethyl ether (50 mL). The combined organic phases were dried over MgSO4 and evaporated in vacuo affording 176 mg (36%) pure 3-(4,5-dimethoxy-2-nitrobenzyloxycarbonylamino)-butyric acid. 1H-NMR (CDCl3): 7.72 (s, 1H), 7.02 (s, 1H), 5.51 (s, 2H), 5.40-5.30 (br s, 1H), 4.15 (m, 1H), 3.96 (s, 3H), 3.92 (s, 3H), 2.60 (d, 2H), 1.31 (d, 3H). 1 Burgess et al. J. Org. Chem. (1997), 62, 5165-68, Alvarez et al. J. Org. Chem. (1999), 64, 6319-28 and Pedersen et al. Proc Natl Acad Sci (1998), 95, 10523-28

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