1M HCl in diethyl ether (1.4 ml) was added to a stirred suspension of 4-[({4-[(3-chloro-2-fluorophenyl)amino]-7-methoxyquinazolin-6-yl}methyl)amino]tetrahydro-2H-pyran-4-carboxylic acid (0.66 g, 1.43 mmol), acetaldehyde (1.6 ml, 28.6 mmol) and anhydrous magnesium sulfate (0.34 g, 2.83 mmol) in methanol (10 ml). Sodium cyanoborohydride (0.36 g, 5.71 mmol) was added and the resulting mixture heated at 40° C. for 4 hours. The reaction mixture was then filtered and evaporated. The residues were purified by column chromatography on silica, eluting with 7M ammonia in methanol/methylene chloride (16/84). Fractions containing the desired product were combined and evaporated. The resulting gum was triturated with diethyl ether to give 4-[({4-[(3-chloro-2-fluorophenyl)amino]-7-methoxyquinazolin-6-yl}methyl)(ethyl)amino]tetrahydro-2H-pyran-4-carboxylic acid as a white solid (440 mg, 63%); 1H NMR Spectrum: (DMSO-d6) δ 0.79 (t, 3H), 1.71-1.84 (m, 2H), 2.07-2.11 (d, 2H), 2.67-2.76 (q, 2H), 3.23-3.33 (t, 2H), 3.80-3.88 (m, 2H), 3.89-3.95 (m, 5H), 7.16 (s, 1H), 7.22-7.29 (m, 1H), 7.43-7.49 (m, 1H), 7.52-7.57 (dd, 1H), 8.38 (s, 1H), 8.41 (s, 1H); Mass Spectrum: (M+H)+ 489.
