Ethoxalyl chloride → ethyl (1-methyl-2-phenyl-1H-indol-3-yl)-oxo-acetate

関与物質

反応条件

反応手順

At 0° C., aluminum (III) chloride (2.5 g, 19 mmol) was added per portion to a solution of 1-methyl-2-phenyl-1H-indole (1 g, 4.8 mmol) and ethyl chlorooxoacetate (900 μL, 8.05 mmol) in dichloromethane (10 mL). The mixture was stirred for 2 hours at 0° C. and then hydrolyzed with a saturated solution of sodium bicarbonate. After removing the aqueous layer, organic layer was washed with water, brine, dried over sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by flash chromatography on silica gel (cyclohexane/ethyl acetate 90/10) to afford the desired keto-ester (8a) (630 mg, 2.05 mmol, 43%).

情報源と証拠