A solution of the product of Example 19C (290 mg, 0.546 mmol) in anhydrous tetrahydrofuran (5 mL) was treated with 5-amino-2-methoxypyridine (78.5 mg, 0.601 mmol) and diisopropylethylamine (0.143 mL, 0.819 mmol), and stirred at room temperature under a nitrogen atmosphere for 18 hours. The reaction was diluted with ethyl acetate (100 mL) and washed with saturated aqueous sodium bicarbonate (25 mL), water (2×25 mL), and brine (25 mL). The organic phase was dried over anhydrous sodium sulfate, filtered, and concentrated in vacuo. Trituration with 3% methanol/methylene chloride provided the title compound as a dark yellow solid (202 mg, 60%).
