반응 #170997

반응 방정식

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

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

triethylamine

benzyloxy acetyl chloride

→

51

수율 59.8%

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

수율 59.8%

용매

acetone

반응 조건

후처리

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

실험 절차

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)

출처