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In a 20 mL-volume glass vessel equipped with a stirrer, a thermometer and a reflux condenser were placed 2.00 g (7.35 mmol) of 6-iodoquinazolin-4-one, 1.24 g (8.09 mmol) of phosphorus oxychloride, and 10 mL of toluene in a nitrogen atmosphere. While the mixture was stirred at room temperature, 0.82 g (8.09 mmol) of triethylamine was slowly added. The resulting mixture was heated to 75° C., and the reaction was carried out for 2 hours. After the reaction was complete, the reaction mixture was cooled to room temperature, and 100 mL of methanol was added. The mixture was stirred for 15 minutes at the same temperature, to give 6-iodo-4-methoxyquinazoline. Analysis of the reaction mixture by high performance liquid chromatography indicated that 2.11 g (reaction yield: 99%) of 6-iodo-4-chloroquinazoline was produced.

1. customIn a 20 mL-volume glass vessel equipped with a stirrer
2. temperatureThe resulting mixture was heated to 75° C.
3. temperaturethe reaction mixture was cooled to room temperature
4. stirringThe mixture was stirred for 15 minutes at the same temperature