Diisopropylethylamine → N-[6-[3-[4-(Diphenylmethoxy)piperidino]propylamino][1,2,4]triazolo[4,3-b]pyridazine-3-carbonyl]-2,2-dimethylglycine Ethyl Ester

Participants

Reaction Conditions

Reaction Steps

1.25 g of 4-(diphenylmethoxy)-1-piperidinepropanamine and 1.20 g of N-(6-chloro[1,2,4]triazolo[4,3-b]pyridazine-3-carbonyl)-2,2-dimethylglycine ethyl ester were dissolved in 20 ml of N,N-dimethylformamide; 1.33 ml of N-ethyldiisopropylamine was added, followed by stirring under heating at an external temperature of 60° C. for 7.5 hours. After cooling, cold aqueous sodium bicarbonate was added; the reaction mixture was extracted with ethyl acetate, washed with saturated saline, and dried over magnesium sulfate. After concentration under reduced pressure, the residue was subjected to silica gel column chromatography and eluted with ethyl acetate-methanol-triethylamine (50:5:1). The desired fraction was collected and concentrated under reduced pressure; the precipitated crystal was recrystallized from ethanol-ethyl acetate fir (1:3), collected by filtration, and dried, to yield 1.17 g of the title compound.

Provenance & Evidence