Cesium fluoride → (E)-methyl 6-amino-2-(4-chloro-2,3-difluorophenyl)-5-(2-(trimethylsilyl)vinyl)pyrimidine-4-carboxylate

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(E)-Trimethyl(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)vinyl)silane (470 mg, 2.1 mmol, 1.2 equiv) and methyl 6-amino-5-bromo-2-(4-chloro-2,3-difluorophenyl)pyrimidine-4-carboxylate (650 mg, 1.7 mmol, 1.0 equiv) were sequentially added to a 5 mL Biotage microwave vessel, followed by cesium fluoride (260 mg, 1.7 mmol, 1.0 equiv), palladium(II) acetate (19 mg, 0.086 mmol, 0.05 equiv), and sodium 3,3′,3″-phosphinetriyltribenzenesulfonate (98 mg, 0.17 mmol, 0.10 equiv). A 3:1 mixture of water:acetonitrile (3.5 mL) was added and the resulting brown mixture was placed in a Biotage microwave and heated to 150° C. for 15 m. The cooled reaction mixture was diluted with water (150 mL) and extracted with dichloromethane (3×50 mL). The combined organic layers were dried (magnesium sulfate), gravity filtered, and concentrated under vacuum. The product was purified by silica gel column chromatography (17% ethyl acetate in hexane) to afford the title compound as an off-white powder (290 mg, 43% yield): mp 139-141° C.; 1H NMR (300 MHz, CDCl3) δ 7.76 (m, 1H), 7.22 (m, 1H), 6.94 (d, 1H, J=20 Hz), 6.37 (d, 1H, J=20 Hz), 5.38 (br s, 2H), 3.92 (s, 3H), 0.19 (s, 9H); IR (neat film) 3449 (m), 3350 (s), 3242 (m), 3103 (w), 2954 (m), 1728 (s), 1634 (s); ESIMS m/z 398 ([M+H]+).

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