54% | With 2-(1H-benzotriazol-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate; triethylamine; In N,N-dimethyl-formamide; at 20℃; | Example 10: A mixture of Example A8 (0.363 g, 1.559 mmol), Example Al (0.200 g, 0.779 mmol), and TBTU (0.751 g, 2.338 mmol) in DMF (15 mL) was treated with Et3N (0.652 mL, 4.68 mmol) and stirred at RT overnight. The mixture was treated with brine, extracted with EtOAc (2x) and the combined organics were washed successively with 5% citric acid (2x), satd. NaHCO3 (ix), 5% LiC1 (ix), and brine (ix), dried over Mg504, concentrated to dryness and purified via silica gel chromatography (EtOAc/Hex). The resulting material was treated with 4:1 MeCN/H20, the solid collected via filtration and driedafford N-(4-((2-chloropyridin-4-yl)oxy)-2,5-difluorophenyl)-5 -(4-fluorophenyl)-4-oxo- 1,4- dihydropyridine-3-carboxamide (200 mg, 54%) as a white solid. ?H NMR (400 MHz, DMSO-d6): oe 13.48 (s, 1 H), 12.72 (s, 1 H), 8.60-8.58 (m, 2 H), 8.30 (d, J = 5.3 Hz, 1 H), 8.09 (s, 1 H), 7.67-7.65 (m, 3 H), 7.26-7.23 (m, 2 H), 7.17 (s, 1 H), 7.06 (s, 1 H); MS (ESI) mlz: 472.0 (M+Hj. |