Reaktion #725902

Reaktionsgleichung

(4-Isocyanato-phenoxy)-acetic acid methyl ester

ethylene glycol

→

29

Ausbeute 82.9%

[4-(2-Hydroxy-ethoxycarbonylamino)-phenoxy]-acetic acid methyl ester

Ausbeute 82.9%

Lösungsmittel

Water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Filtrationcrude 29 was filtered
2. 2
   Sonstigedried
3. 3
   Sonstigepurified by column chromatography on silica gel

Vorschrift

(4-Isocyanato-phenoxy)-acetic acid methyl ester 28 (15 g, 72.46 mmol) was added to ethylene glycol (30 ml) at room temperature. The reaction was exothermic and the temperature raised to 42° C. Later the reaction mixture was stirred at room temperature for 16 hours. Water (100 ml) was added and crude 29 was filtered, dried and purified by column chromatography on silica gel using chloroform as eluant to get pure 29 (16.17 g, 82.9%) as a off-white powder. M.p: 85.5-87.5° C.

Quelle