6-Chloro-8-(4-chlorophenyl)-7-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one → 8-(4-chlorophenyl)-7-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazine-3,6(2H,5H)-dione

Participants

Reaction Steps

To the solution of 6-Chloro-8-(4-chlorophenyl)-7-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazin-3(2H)-one (29 mg, 0.081 mmol), prepared as described in Example 9, in THF (3 ml) was added potassium trimethylsilyloxide, TMSOK, (36 mg, 0.28 mmol). The solution was heated to refluxed for 15 min. After this time, the solution was cooled to RT. The reaction mixture was concentrated under reduced pressure. The crude material was purified by reverse phase HPLC to give the title compound, 8-(4-chlorophenyl)-7-(pyridin-4-yl)-[1,2,4]triazolo[4,3-b]pyridazine-3,6(2H,5H)-dione, (12 mg, 32%) as a yellow solid.

Provenance & Evidence