N-(2-Aminoethyl)piperidine → HCID 14390296, compound

Participants

Reaction Steps

A solution of 2-(3-chlorophenyl)-3H-imidazo[4,5-b]pyridine-3-acetic acid (5.4 g, 0.0188 mole), 1,1'-carbonyldiimidazole (3.0 g, 0.0188 mole) in anhydrous tetrahydrofuran (150 ml) was stirred at room temperature with a stream of nitrogen bubbling through it for 21/2 hours. The nitrogen flow was stopped and a solution of 1-(2-aminoethyl)piperidine (2.4 g, 0.0188 mole) in dry tetrahydrofuran (50 ml) was added. The solution was stirred at room temperature under nitrogen for 2 hours. The reaction mixture was concentrated in vacuo and the residue partitioned between methylene chloride (75 ml) and water (75 ml). The layers were separated and the aqueous portion washed with methylene chloride (25 ml). The organic layers were combined and washed with potassium bicarbonate solution (2×50 ml), water (25 ml), dried over sodium sulfate, and concentrated in vacuo. The residue (6.6 g) was recrystallized from isopropyl alcohol-isopropyl ether to give 3.5 g (47%). Recrystallization from isopropyl alcohol-isopropyl ether gave 2.5 g of cream colored solid, mp 114°-115° C.

Provenance & Evidence