To (R)-{1-[2-(2-hydroxy-phenyl)-7-methyl-quinazolin-4-yl]-pyrrolidin-3-yl}-carbamic acid tert-butyl ester (1.54 g, 3.67 mmol) at room temperature was added 10 mL of a 1:1 TFA:CH2Cl2 solution. The reaction mixture was stirred for 30 min and diluted with 10 mL of saturated NaHCO3 and 15 mL of CH2Cl2. The resulting emulsion was filtered, and the organic layer was separated and dried over Na2SO4. The solvent was removed under reduced pressure to give (R)-2-[4-(3-amino-pyrrolidin-1-yl)-7-methyl-quinazolin-2-yl]-phenol. LC/MS: m/z 321.2 (M+H)+ at 1.91 min (10%-99% CH3CN (0.035% TFA)/H2O (0.05% TFA)).
