Potassium Carbonate → 2-Ethoxy-3-[4-(2-{4-methylsulfonyloxyphenyl}ethoxy)-2-nitrophenyl]propanoic acid methyl ester

Participants

Reaction Steps

2-(4-Methanesulfonyloxyphenyl)ethylmethanesulfonate (1.14 g; 3.87 mmole), 2-ethoxy-3-(4-hydroxy-2-nitrophenyl)propanoic acid methyl ester (1.04 g; 3.86 mmole) and potassium carbonate (1.07 g; 7.75 mmole) were mixed in acetonitrile (approx. 100 ml). The reaction mixture was heated to reflux for 6 hours and according to TLC the reaction was not complete. Another portion of 2-(4-methanesulfonyloxyphenyl)ethylmethanesulfonate (0.2 g; 0.68 mmole) was added. The reaction mixture was heated to reflux over night, and then evaporated to dryness. Ethyl acetate and water were added into the residue. The phases were separated and the organic phase was washed with brine, dried with magnesium sulfate and evaporated. Chromatography of the crude product on silica gel with a gradient of ethyl acetate/heptane as eluant gave 1.47 g (81% yield) of 2-ethoxy-3-[4-(2-{4-methylsulfonyloxyphenyl}ethoxy)-2-nitrophenyl]propanoic acid methyl ester.

Provenance & Evidence