Diisopropylethylamine → Benzyl 3-((3-chloropyrazin-2-yl)methylcarbamoyl)azetidine-1-carboxylate

Participants

Reaction Steps

N,N-diisopropylethylamine (109 mmol, 18.01 ml) and a solution of benzyl 3-(chlorocarbonyl)azetidine-1-carboxylate (5.53 g) in dichloromethane (32.5 ml) were added to a stirred suspension of 2-aminomethyl-3-chloropyrazine hydrochloride (content 77%; 21.80 mmol, 5.10 g) in dichloromethane (55 ml) at room temperature to give a dark brown solution. After stirring at room temperature for two hours the reaction mixture was quenched with water and filtered over decalite. Layers were separated and to the aqueous layer saturated aqueous sodium hydrogencarbonate solution was added and the layer was extracted three times with dichloromethane. The organic layers were combined, washed with brine, dried (sodium sulfate), and concentrated in vacuo. The residue was purified by column chromatography (silica gel, dichloromethane/methanol gradient 10/0 to 9/1) to give benzyl 3-((3-chloropyrazin-2-yl)methylcarbamoyl)azetidine-1-carboxylate (6.46 g).

Provenance & Evidence