HCID 18423420, compound → HCID 68513160, compound

Participants

Reaction Steps

To a solution of 233 mg of tert-butyl 4-(2-hydroxy propyl)piperidine-1-carboxylate in 4 mL of ethyl acetate was added 3 mL of 4M HCl/EtOAc, followed by stirring at room temperature for 2 hours. The reaction liquid was concentrated under reduced pressure to obtain 4-(2-hydroxypropyl)piperidine hydrochloride. To a solution of the 4-(2-hydroxypropyl)piperidine hydrochloride and 155 mg of indole-2-carboxylic acid in 5 mL of DMF were added 0.15 mL of triethylamine, 190 mg of 1-ethyl-3-(dimethylaminopropyl)carbodiimide hydrochloride and 130 mg of 1-hydroxybenzotriazole, followed by stirring at room temperature for 1 day. 0.5M aqueous hydrochloric acid was added to the reaction liquid, followed by extraction with ethyl acetate. The organic layer was washed with 0.5M aqueous sodium hydroxide solution and saturated brine, dried over anhydrous sodium sulfate, and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography [chloroform:methanol=1:0-10:1], and then solidified using diisopropyl ether to obtain 49 mg of 1-[1-(1H-indol-2-ylcarbonyl)piperidin-4-yl]propan-2-ol as a white solid.

Provenance & Evidence