Reaktion #476879

Reaktionsgleichung

EtOAc

pyridinium hydrobromide

ethyl p-anisoylacetate

triethylamine

→

ethyl 2-bromo-3-(4-methoxyphenyl)-3-oxopropanoate

Ausbeute 89.0%

Lösungsmittel

ethanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe reaction was cooled to room temperature
2. 2
   WaschenThe organic phase was then washed with saturated sodium bicarbonate solution and 0.5M aqueous HCl
3. 3
   Trocknendried over MgSO4
4. 4
   Sonstigethe solvent removed in vacuo

Vorschrift

To a solution of ethyl p-anisoylacetate (1.00 g, 4.5 mmol) in ethanol (14 mL) at 50° C. was added triethylamine (0.63 mL, 4.5 mmol) followed by pyridinium hydrobromide perbromide (1.44 g, 4.5 mmol) and the resulting mixture was then stirred at 50° C. for 2 hours. The reaction was cooled to room temperature and poured into EtOAc. The organic phase was then washed with saturated sodium bicarbonate solution and 0.5M aqueous HCl, dried over MgSO4 and the solvent removed in vacuo to afford ethyl 2-bromo-3-(4-methoxyphenyl)-3-oxopropanoate (1.209 g, 4.0 mmol, 89%) which was used without further purification. 1H NMR (CDCl3) δ 1.26 (3H, t), 3.89 (3H, s), 4.28 (2H, q), 5.62 (1H, s), 6.96 (2H, d), 7.98 (2H, d). LCMS (2) Rt: 3.06 min; m/z (ES+) 301/303.

Quelle