At RT, diisopropyl ethylamine (130 μL, 0.74 mmol) was added to a solution of (R)-2-(4-(3-aminopyrrolidin-1-yl)-7-methylquinazolin-2-yl)-3-fluorophenol (125 mg, 0.37 mmol) in THF (10 mL), and the reaction was cooled to −40° C. Ethyl chloroformate (33 μL in 0.33 mL THF, 0.34 mmol) was added dropwise over a period of 10 minutes. After addition of the chloroformate was complete, the reaction mixture was warmed to RT, quenched with H2O, and extracted with CH2Cl2. The organic phase was dried over MgSO4, filtered, and concentrated. The residue was purified via silica gel chromatography using 0-10% EtOAc in a 1:1 mixture of hexanes and CH2Cl2 to give (R)-ethyl 1-(2-(2-fluoro-6-hydroxyphenyl)-7-methylquinazolin-4-yl)pyrrolidin-3-ylcarbamate (compound 10) (130 mg, 85%). 1H NMR (400 MHz, DMSO-d6) δ 8.19 (d, J=8.6 Hz, 1H), 7.58-7.57 (m, 2H), 7.38-7.29 (m, 2H), 6.76 (d, J=8.3 Hz, 1H), 6.72-6.67 (m, 1H), 4.25-4.21 (m, 1H), 4.16-4.13 (m, 2H), 4.07-3.97 (m, 3H), 3.84-3.82 (m, 1H), 2.52 (s, 3H), 2.24-2.16 (m, 1H), 2.04-2.00 (m, 1H), 1.16 (t, J=7.1 Hz, 3H) ppm. LC/MS: m/z 411.3 (M+H)+ at 2.24 min (10%-99% CH3CN (0.035% TFA)/H2O (0.05% TFA)).
