反应详情

A mixture of 0.96 g (5.0 mmol) of 7-chloro-2-methyl-4(3H)-quinazolinone and 0.20 g (4.8 mmol) of lithium hydroxide monohydrate in 25 ml of tetrahydrofuran is heated at reflux with stirring for 0.5 h. After cooling to room temperature, 0.89 g (4.8 mmol) of methyl p-toluene sulfonate is added and the reaction mixture heated at reflux for 4 hours. The reaction mixture is neutralized with con. HCl and the solvent removed in vacuo to give a residue. The residue is slurried with 50 ml of water, filtered, washed with 50 ml of 0.5M sodium hydroxide, followed by (3×50 ml) of water. The solid is dried to give 0.73 g (73%) of the desired product, m.p. 162°-165° C. None of the isomeric O-alkylated product is detected by HPLC.

1. temperatureis heated
2. temperatureat reflux
3. temperaturethe reaction mixture heated
4. temperatureat reflux for 4 hours
5. customHCl and the solvent removed in vacuo
6. customto give a residue
7. filtrationfiltered
8. washwashed with 50 ml of 0.5M sodium hydroxide
9. customThe solid is dried