反应 #1810813

反应方程式

allylamine

triethylamine

Benzylchloroformate

ethyl bromoacetate

sodium hydroxide

→

N-Allylglycine ethyl ester

acid 7

carbamate

溶剂

Brine

dichloromethane

反应条件

后处理

1. 1
   其他resulting in a white precipitate
2. 2
   过滤filtered
3. 3
   浓缩the filtrate concentrated in vacuo
4. 4
   洗涤washed with 2M aqueous hydrochloric acid
5. 5
   干燥dried (MgSO4)
6. 6
   其他the solvent removed
7. 7
   workup.ADDITIONcontaining the desired carbamate (70%) and benzyl alcohol (30%)
8. 8
   workup.DISSOLUTIONThis mixture was dissolved in dioxane/methanol (8:3, 110 cm3)
9. 9
   萃取the aqueous layer extracted with diethyl ether
10. 10
    萃取extracted with ethyl acetate
11. 11
    干燥The combined organic layers were dried (MgSO4)
12. 12
    浓缩concentrated in vacuo
13. 13
    其他the residue purified by chromatography (silica gel, hexane:ethyl aceate:acetic acid, 3:1:0.4)

实验过程

N-Allylglycine ethyl ester 54 was prepared as described above using ethyl bromoacetate (9 g, 53.9 mmol) and allylamine (6.15 g, 107.7 mmol). The crude product (7.054 g) that contained ˜30% of N-allyl-N-bis(2-carboethyoxyethyl)amine as judged by NMR, was dissolved in dichloromethane (50 cm3), cooled to 0° C. and triethylamine (6.53 g, 64.09 mmol) added. Benzylchloroformate (9.25 g, 54.2 mmol) was added dropwise over 10 min resulting in a white precipitate. After 2 h the mixture was stored overnight at 0° C., filtered and the filtrate concentrated in vacuo. The residue was subsequently suspended in dichloromethane, washed with 2M aqueous hydrochloric acid, dried (MgSO4) and the solvent removed to reveal an oil (13.65 g) containing the desired carbamate (70%) and benzyl alcohol (30%) as judged by NMR. This mixture was dissolved in dioxane/methanol (8:3, 110 cm3), 1M aqueous sodium hydroxide (40 cm3, 40 mmol) added and the solution stirred for 2 h at room temperature. Brine (50 cm3) was added and the aqueous layer extracted with diethyl ether. The aqueous layer was acidified with 32% hydrochloric acid and extracted with ethyl acetate. The combined organic layers were dried (MgSO4), concentrated in vacuo, and the residue purified by chromatography (silica gel, hexane:ethyl aceate:acetic acid, 3:1:0.4) to give acid 7 (7.05 g, 52%, 3 steps) as a colourless syrup. Acid 55 existed as a 1:1 mixture of carbamate rotamers: δH (400 MHz; CDCl3; Me4Si) 4.02-4.08 [4H, m, CH2(allyl), CH2(Gly)], 5.17-5.24 (4H, m, OCH2Ph, ═CH2), 5.77-5.84 (1H, m, C(H)═CH2), 7.32-7.39 (m, 5H, Ph) and 8.45 (1H, br s, OH); δC (100 MHz; CDCl3) 47.1, 47.7 [CH2, CH2(Gly)], 50.5, 50.7 [CH2, CH2(allyl)], 67.6, 67.7 (CH2, OCH2Ph), 117.8, 118.3 (CH2, ═CH2), 127.7, 127.97, 128.01, 128.4, (CH, Ph), 132.7, 132.8 (CH, C(H)═CH2) 136.1 (quat., Ph), 155.8, 156.5, (quat., NCO2) and 174.7, 174.9 (quat., CO).

来源