Cesium carbonate → 9-(4-cyclopropylpiperazin-1-yl)-6-(4-methoxybenzyl)pyrido[3,2-e][1,2,4]triazolo[1,5-c]pyrimidin-5(6H)-one

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9-Bromo-6-(4-methoxybenzyl)pyrido[3,2-e][1,2,4]triazolo[1,5-c]pyrimidin-5(6H)-one (63 mg, 0.16 mmol) and 1-cyclopropylpiperazine (103 mg, 0.82 mmol) were dissolved in toluene (2 ml) and nitrogen was bubbled through the mixture while 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (41 mg, 0.07 mmol), cesium carbonate (159 mg, 0.49 mmol) and palladium(II) acetate (7 mg, 0.03 mmol) were added. The mixture was heated at 100° C. for 16 hours. It was concentrated under a stream of nitrogen and the residue was taken up in DMF, filtered and purified by preparative HPLC to afford 25 mg (27%) of the title compound as a yellow solid.

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