Water → 8-Methyl-6-pyrrolidin-1-yl-[1,2,4]triazolo[4,3-b]pyridazin-3-ylamine

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Reaction Steps

6-Chloro-8-methyl-[1,2,4]triazolo[4,3-b]pyridazin-3-ylamine hydrobromide (W2.002; 250 mg) was dissolved in DMF (2 ml) and admixed with pyrrolidine (2 ml). Thereafter, the reaction mixture was placed into the heating block at 80° C. with stirring for 1.5 h. Subsequently, the solvent was drawn off and the residue was admixed with a little water and extracted three times with dichloromethane. The combined organic phases were dried over sodium sulfate, filtered and concentrated. When the residue was dissolved in acetonitrile/water+0.05% TFA, a solid precipitated out, which was filtered off with suction and dried. 40 mg of 8-methyl-6-pyrrolidin-1-yl-[1,2,4]triazolo[4,3-b]pyridazin-3-ylamine were obtained. The mother liquor was purified by means of preparative HPLC (met. A), and the clean product fractions were combined, freed of the acetonitrile under reduced pressure and freeze-dried. 11 mg of 8-methyl-6-pyrrolidin-1-yl-[1,2,4]triazolo[4,3-b]pyridazin-3-ylamine were obtained as the trifluoroacetic acid salt. 8-Methyl-6-pyrrolidin-1-yl-[1,2,4]triazolo[4,3-b]pyridazin-3-ylamine

Provenance & Evidence