Ethyl 2-(6-chloroimidazo[1,2-b]pyridazin-2-yl)-2-methylpropanoate → Ethyl 2-[6-[5-[4-(Diphenylmethoxy)piperidino]pentylamino]imidazo[1,2-b]pyridazin-2-yl]-2-methylpropionate Difumarate

Beteiligte Stoffe

Reaktionsschritte

1.41 g of 4-(diphenylmethoxy)-1-piperidinepentanamine and 0.536 g of ethyl 2-[6-chloroimidazo[1,2-b]pyridazin-2-yl]-2-methylpropionate were stirred at 190-200° C. for 3.5 hours. After cooling, ethyl acetate-tetrahydrofuran (2:1) was added; the mixture was washed with aqueous sodium bicarbonate and saturated saline and dried with sodium sulfate. The dry product was concentrated under reduced pressure; the residue was subjected to silica gel column chromatography and eluted with ethyl acetate:methanol:triethylamine (185:15:2). The desired fraction was collected, dissolved in 5 ml of ethanol; a solution of 235 mg of fumaric acid in 5 ml of methanol was added, followed by concentration. Ethyl ether was added to the residue; the resulting powder was collected by filtration, washed with ethyl ether and dried to yield 0.629 g of the title compound.

Herkunft & Nachweise