Intermediate 1 (Example 2) (0.098 g, 0.286 mmol) was combined with 2-chloro-4,6-dimethoxy-1,3,5-triazine (CDMT) (0.060 g, 0.343 mmol) and diluted with DCM (4 mL). This was immediately treated with 4-methyl morpholine (0.063 mL, 0.55 mmol) and allowed to stir at ambient temperature for 1 h. Intermediate 13 (Example 20) (0.130 g, 0.3 mmol) was then added in one portion. Stirring was continued overnight. After 18 h, reaction solvents were removed and resulting crude solids were purified via HPLC to afford the title compound as a white solid (0.056 g, 26%).
