Ethyl bromoacetate → Ethyl 3-ethoxyphenoxyacetate

Reaktionsgleichung

[CH2:1]([O:3][C:4]1[CH:5]=[C:6]([OH:10])[CH:7]=[CH:8][CH:9]=1)[CH3:2].C([O-])([O-])=O.[K+].[K+].Br[CH2:18][C:19]([O:21][CH2:22][CH3:23])=[O:20]>CN(C=O)C>[CH2:1]([O:3][C:4]1[CH:5]=[C:6]([CH:7]=[CH:8][CH:9]=1)[O:10][CH2:18][C:19]([O:21][CH2:22][CH3:23])=[O:20])[CH3:2]

Komponenten

Versuchsvorschrift

A 500 mL flask fitted with a stir-bar and septum with an Ar inlet was charged with 3-ethoxyphenol (20.4 g, 148 mmol), K2CO3 (28.5 g, 222 mmol), and DMF (250 mL). To the resultant solution was added ethyl bromoacetate (27.1 g, 18.0 mL, 162 mmol) and the mixture stirred overnight. The solids were filtered off and rinsed with EtOAc (500 mL). The filtrate was washed with saturated aqueous NH4Cl (2×250 mL), H2O (2×250 mL), and brine (200 mL), filtered through phase separation paper, and concentrated in vacuo to give 33.6 g of ethyl 3-ethoxyphenoxyacetate as a colorless oil (100%). 1H NMR (60 MHz, CDCl3): δ 7.2-6.9 (m, 1H), 6.6-6.3 (m, 3H), 4.6 (s, 2H), 4.2 (qt, 2H), 4.0 (qt, 2H), 1.4 (t, 3H), 1.3 (t, 3H) ppm. HPLC analysis (0:10:90 H2O:A1:MeOH) showed a purity of 98% with a retention time of 5.3 min.