反应详情

To a round-bottom flask with stir bar was added 4-hydroxy-3-methyl-benzofuran-2 carboxylic acid t-butyl ester (1 mmole), methyl 2-bromoacetate (1.1 eq.) potassium carbonate (5 equiv.) and 10 mL of DMF. The reaction mixture was stirred overnight and then slowly added dropwise to water (10 mL) with stirring. The resulting mixture was extracted with ethyl acetate (2×20 mL), brine (20 mL), dried over magenesium sulfate. Filtration and evaporation of solvent gave 4-methoxycarbonylmethoxy-3-methyl-benzofuran-2-carboxylic acid tert-butyl ester as a thick oil in 92% yield.

1. stirringThe reaction mixture was stirred overnight
2. stirringwith stirring
3. extractionThe resulting mixture was extracted with ethyl acetate (2×20 mL), brine (20 mL)
4. dry with materialdried over magenesium sulfate
5. filtrationFiltration and evaporation of solvent