Triethylamine → 6-(4-methoxybenzyl)-9-vinylpyrido[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 (2.00 g, 5.18 mmol), potassium trifluoro(vinyl)borate (1.51 g, 11.3 mmol), butan-1-ol (20 ml), triethylamine (1.05 ml, 7.53 mmol) and [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II)-dichloromethane complex (0.31 g, 0.38 mmol) were combined and heated at 100° C. for 20 hours. The mixture was cooled, concentrated under vacuum and taken up in dichloromethane (120 mL). It was washed with water (50 mL) and brine (50 mL), dried (MgSO4) and concentrated under vacuum. The residue was triturated with ethyl acetate (15 mL) for 20 hours, filtered, washed with cold ethyl acetate and suction dried to afford 1.09 g (63%) of the title compound as a yellow powder. 1H NMR (400 MHz, CDCl3) δ 3.76 (s, 3H), 5.52 (d, J=10.92 Hz, 1H), 5.75 (s, 2H), 5.98 (d, J=17.57 Hz, 1H), 6.75-6.88 (m, 3H), 7.60 (d, J=8.66 Hz, 2H), 8.36 (s, 1H), 8.66 (d, J=2.13 Hz, 1H), 8.79 (d, J=2.26 Hz, 1H). LCMS (MH+, 334.1).

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