To a solution of 5-(5-phenyl-4-(pyridin-2-ylmethylamino)quinazolin-2-yl)nicotinohydrazide (from Example 185, 0.30 g, 0.66 mmol) in DCM at 0° C. was added methyl 2-chloro-2-oxoacetate (0.062 mL, 0.66 mmol) and potassium carbonate (0.273 g, 1.90 mmol). Upon completion of addition, the mixture was stirred at RT for 16 h. After this time, water was added and the mixture was extracted into DCM, dried and concentrated. The resulting residue was dissolved in DCM. Triflic anhydride (0.187 mL, 1.1 mmol) and pyridine (0.149 mL, 1.8 mmol) were added and the resulting mixture was stirred at RT for 16 h. At the conclusion of this period, the reaction mixture was quenched with water and extracted with DCM (100 mL). The DCM layer was washed with water and brine. Chromatographic purification provided methyl 5-(5-(5-phenyl-4-(pyridin-2-ylmethylamino)quinazolin-2-yl)pyridin-3-yl)-1,3,4-oxadiazole-2-carboxylate (270 mg, 78% yield) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ (ppm): 9.81 (s, 1H), 9.17 (s, 1H), 9.09 (s, 1H), 8.24 (d, J=4.4 Hz, 1H), 7.94 (d, J=7.2 Hz, 1H), 7.86 (t, J=7.6 Hz, 1H), 7.75-7.72 (t, J=7.6 Hz, 3H), 7.59-7.51 (m, 5H), 7.34 (d, J=7.2 Hz, 2H), 7.24 (t, J=6.4 Hz, 1H), 6.98 (t, J=3.2 Hz, 1H), 4.77 (d, J=4.0 Hz, 2H). LCMS Method Q: retention time 1.39 min; [M+1]=514.5; HPLC Method B: purity 98.1%, retention time=8.74 min.
