Hydrochloric Acid → Asp-9521

Participants

Reaction Steps

To a solution of 478 mg of 5-methoxyindole-2-carboxylic acid and 432 mg of 2-methyl-1-(piperidin-4-yl)-2-propanol in 8 mL of DMF were added 575 mg of 1-ethyl-3-(dimethylaminopropyl)carbodiimide hydrochloride and 169 mg of 1-hydroxybenzotriazole, followed by stirring at room temperature for 1 day. 0.2M aqueous hydrochloric acid was added to the reaction liquid, followed by extraction with ethyl acetate. The organic layer was washed with 0.2M aqueous sodium hydroxide solution and saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography [chloroform:methanol=1:0-24:1], and then crystallized from a mixture of ethyl acetate/diisopropyl ether to obtain 683 mg of 1-{1-[(5-methoxy-1H-indol-2-yl)carbonyl]piperidin-4-yl}-2-methylpropan-2-ol as a white crystal.

Provenance & Evidence