تفاعل #1810813

معادلة التفاعل

allylamine

triethylamine

Benzylchloroformate

ethyl bromoacetate

sodium hydroxide

→

N-Allylglycine ethyl ester

acid 7

carbamate

المذيبات

Brine

dichloromethane

ظروف التفاعل

المعالجة

1. 1
   أخرىresulting in a white precipitate
2. 2
   ترشيحfiltered
3. 3
   تركيزthe filtrate concentrated in vacuo
4. 4
   غسيلwashed with 2M aqueous hydrochloric acid
5. 5
   تجفيفdried (MgSO4)
6. 6
   أخرىthe 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
   استخلاصthe aqueous layer extracted with diethyl ether
10. 10
    استخلاصextracted with ethyl acetate
11. 11
    تجفيفThe combined organic layers were dried (MgSO4)
12. 12
    تركيزconcentrated in vacuo
13. 13
    أخرىthe residue purified by chromatography (silica gel, hexane:ethyl aceate:acetic acid, 3:1:0.4)

الإجراء التجريبي

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).

المصدر