Potassium Phosphate, Tribasic → [4-(5-Bromo-1-methyl-6-oxo-1,6-dihydropyridin-3-yl)-2-{4,4-dimethyl-9-oxo-1,10-diazatricyclo[6.4.0.02,6]dodeca-2(6),7-dien-10-yl}pyridin-3-yl]methyl Acetate

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A 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer was charged with 3-bromo-5-iodo-1-methylpyridin-2(1H)-one 214b (1.57 g, 5.0 mmol), {3-[(acetyloxy)methyl]-2-{4,4-dimethyl-9-oxo-1,10-diazatricyclo[6.4.0.02,6]dodeca-2(6),7-dien-10-yl}pyridin-4-yl}boronic acid 199e (1.98 g, 5.0 mmol), PdCl2(dppf) (205 mg, 0.25 mmol), K3PO4 (2.12 g, 10.0 mmol), sodium acetate (820 mg, 10.0 mmol), acetonitrile (45 mL), and water (1 mL). The system was evacuated and refilled with N2. The reaction mixture was stirred at 30° C. for 3 h. It was then filtered and the filtrate was concentrated under reduced pressure. The resulting residue was purified by silica-gel column chromatography eluting with 30:1 dichloromethane/methanol to afford 273a (580 mg, 22%) as a white solid. MS-ESI: [M+H]+ 539.2. 1H NMR (500 MHz, CDCl3) δ 8.49 (d, J=5.0 Hz, 1H), 7.84 (d, J=2.5 Hz, 1H), 7.45 (d, J=2.0 Hz, 1H), 7.09 (d, J=5.0 Hz, 1H), 6.79 (s, 1H), 5.15 (s, 2H), 4.55-4.51 (m, 1H), 4.27-4.25 (m, 1H), 4.15-4.13 (m, 1H), 4.06-4.04 (m, 1H), 3.68 (s, 3H), 2.58-2.56 (m, 2H), 2.51 (s, 2H), 1.86 (s, 3H), 1.28 (s, 6H).

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