Dimethyl Sulfoxide → 2-(1H-indol-4-yloxy)-2-methylpropionic acid ethyl ester

Beteiligte Stoffe

Reaktionsschritte

A mixture of 4-hydroxyindole (0.100 g, 0.75 mmol, 1.0 eq), powdered potassium hydroxide (0.046 g, 0.83 mmol, 1.1 eq), and DMSO (2 mL) was stirred at room temperature for 1 hour and then ethyl 2-bromo-2-methylpropionate (0.161 g, 0.12 mL, 0.83 mmol, 1.1 eq) was added to the above mixture dropwise. The reaction mixture was stirred at room temperature for another 2 hours before 15 mL of water was added. The mixture was extracted with ethyl acetate (2×30 mL). The organic layer was collected, combined, washed with water (6×25 mL) and brine (2×20 mL), and dried over anhydrous Na2SO4. The solvent was removed in vacuo. The residue thus obtained was purified by flash chromatograph over silica gel using hexane/ethyl acetate (95/5) as an eluant to afford 2-(1H-indol-4-yloxy)-2-methylpropionic acid ethyl ester (0.144 g, yield: 80%).

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