To a suspension of 4-chloro-6-cyano-7-hydroxyquinoline (400 mg, 1.95 mmol), (prepared as described for the starting material in Example 1), 4-(2-hydroxyethoxy)tetrahydropyran (371 mg, 2.54 mmol) and triphenylphosphine (820 mg, 3.12 mmol) in methylene choride (15 ml) was added diethyl azodicarboxylate (492 μl, 3.12 mmol) in portions. After stirring for 30 minutes, triphenylphosphine (512 mg, 1.95 mmol), 4-(2-hydroxyethoxy)-tetrahydropyran (142 mg, 0.98 mmol) and diethyl azodicarboxylate (308 μl, 1.95 mmol) were added. The volatiles were removed under vacuum and the residue was purified by column chrolatography eluting with methylene chloride/ethyl actetate/methanol (60/40/0 followed by 50/50/0, 40/60/0, 60/39/1, 60/38/2 and 50/46/4) to give 4-chloro-6-cyano-7-(2-(tetrahydropyran-4-yloxy)ethoxy)quinoline (519 mg, 65%).
