To a solution of methyl 4-((5-phenyl-2-(pyrimidin-5-yl)quinazolin-4-ylamino)methyl)benzoate (400 mg, 0.89 mmol) in MeOH-THF—H2O (6 mL-6 mL-0.5 mL) was added LiOH (112 mg, 2.67 mmol). Upon completion of addition, the reaction mixture was heated to 45° C. where it stirred for 12 h. After this time, the reaction mixture was concentrated under reduced pressure to remove the MeOH and THF and then carefully acidified with 1.5N HCl. The resulting precipitate was collected by filtration to afford 4-((5-phenyl-2-(pyrimidin-5-yl)quinazolin-4-ylamino)methyl)benzoic acid (250 mg) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ (ppm): 12.87 (bs, 1H), 9.68 (s, 2H), 9.39 (s, 1H), 8.09 (m, 1H), 7.98 (t, J=8.0 Hz, 1H), 7.86 (d, J=8.0 Hz, 2H), 7.53-7.48 (m, 6H), 7.26 (d, J=8.0 Hz, 2H), 6.65 (bs, 1H), 4.78 (d, J=5.2 Hz, 2H). LCMS Method O: retention time 1.73 min, [M+1]=434.2. HPLC Method B: purity 98.1%, retention time 8.24 min.
