N-{2-Chloro-4-[(7-hydroxy-6-methoxy-4-quinazolinyl)oxy]phenyl}-N′-propylurea (65 mg), potassium carbonate (30 mg), and 1,2-dibromoethane (30 μl) were dissolved in N,N-dimethylformamide (4 ml), and the solution was stirred at room temperature for 3 hr. The solvent was removed by distillation under the reduced pressure. Water was added to the residue, and the mixture was extracted with chloroform. The organic layer was dried over anhydrous sodium sulfate. The solvent was removed by distillation under the reduced pressure. The residue was washed with ether to give 36 mg (yield 45%) of N-(4-{[7-(2-bromoethoxy)-6-methoxy-4-quinazolinyl]-oxy}-2-chlorophenyl)-N′-propylurea as an intermediate. The intermediate (36 mg), potassium carbonate (30 mg), and N-methylethanolamine (30 μl) were dissolved in N,N-dimethylformamide (3 ml), and the solution was stirred at room temperature overnight. The solvent was removed by distillation under the reduced pressure. A saturated aqueous sodium hydrogencarbonate solution was added to the residue, and the mixture was extracted with chloroform. The organic layer was dried over anhydrous sodium sulfate. The solvent was removed by distillation under the reduced pressure. The residue was purified by chromatography on silica gel by development with chloroform/methanol to give 21 mg (yield 55%) of the title compound.
