Реакция #170997

Уравнение реакции

2-(4-aminophenoxy)-propionic acid methyl ester

2-(4-Amino-phenoxy)-propionic acid methyl ester

triethylamine

benzyloxy acetyl chloride

→

51

Выход 59.8%

2-[4-(2-Benzyloxyacetylamino)-phenoxy]-propionic acid methyl ester

Выход 59.8%

Растворители

acetone

Условия реакции

Обработка

1. 1
   ФильтрацияThe solids were filtered off
2. 2
   workup.DISTILLATIONacetone distilled off
3. 3
   workup.ADDITIONwater (100 ml) added
4. 4
   ЭкстракцияCrude 51 was extracted into chloroform
5. 5
   Промывкаwashed with 5% sodium bicarbonate (2×100 ml) and water (200 ml)
6. 6
   Сушкаdried over sodium sulphate
7. 7
   workup.DISTILLATIONdistilled
8. 8
   ДругоеCrude 51 was purified by column chromatography on silica gel

Методика

To a mixture of 2-(4-aminophenoxy)-propionic acid methyl ester 10 (20 grams, 102.5 mmol) and triethylamine (23 ml, 165 mmol) in acetone (120 ml) at 0° C. was added dropwise benzyloxy acetyl chloride (28 g, 152 mmol) followed by stirring at room temp for 12 hours. The solids were filtered off, acetone distilled off, and water (100 ml) added. Crude 51 was extracted into chloroform, washed with 5% sodium bicarbonate (2×100 ml) and water (200 ml), then dried over sodium sulphate and distilled. Crude 51 was purified by column chromatography on silica gel using benzene as eluant to get pure 51 (21 g, 59.8%) as a light brown powder with an m.p. between 67-70° C. IH NMR (CDCl3) δ 1.60 (d, 3H, CH3), 3.72 (s, 3H, Ester), 4.02 (s, 2H, CH2), 4.62 (s, 2H, CH2), 4.68 (q, 1H, CH), 6.76 (d, 2H, Ar), 7.30 (m, 5H, Ar), 7.42 (d, 2H, Ar), 8.18 (s, 1H, NH)

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