Sodium Bicarbonate → 6-[3-[4-(Diphenylmethoxy)piperidino]-2-hydroxypropylamino][1,2,4]triazolo[1,5-b]pyridazine

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0.675 g of 3-[4-(diphenylmethoxy)piperidino]-2-hydroxypropylamine and 0.335 g of 6-chloro[1,2,4]triazolo [1,5-b]pyridazine were stirred at 135-140° C. for 3 hours. After cooling, aqueous sodium bicarbonate was added, followed by extraction with ethyl acetate-tetrahydrofuran (2:1); the extract was washed with 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 (90:10:1). The desired fraction was collected, recrystallized from ethyl acetate and dried to yield 0.509 g of the title compound.

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