4-Chloro-7-hydroxy-6-methoxyquinazoline (146 mg, 0.69 mmol), (prepared as described for the starting material in Example 4), was suspended in dichloromethane (7.5 ml). Triphenylphosphine (254 mg, 0.97 mmol) and 2-[4-(2-fluoroethyl)piperazin-1-yl]ethanol (134 mg, 0.76 mmol) were added. Diisopropyl azadicarboxylate (165 μl, 0.83 mmol) was then added dropwise. The reaction mixture was stirred for 2.25 hours at ambient temperature and then loaded directly onto a silica column and eluted with methylene chloride/methanol (92/8) to give 4-chloro-7-{2-[4-(2-fluoroethyl)piperazin-1-yl]ethoxy}-6-methoxyquinazoline (172 mg, 67%).
