反应详情

温度

0 °C

Ethyl 6-chloro-4,5-dihydro-4-methyl-5-oxo-imidazo(1,5-a)-quinazoline-3-carboxylate (2.27 g,7.4 mmol) in a mixture of 50 ml of ethanol, 25 ml of water and 4.6 ml of 4M aqueous sodium hydroxide was refluxed for 1 h. Then the mixture was cooled to 0° C. and neutralized by addition of 4.6 ml of 4M hydrochloric acid. The precipitate was filtered off, rinsed with water and dried to give 2.1 g (100%) of 6-chloro-4,5-dihydro-4-methyl-5-oxo-imidazo(1.5-a)quinazoline-3-carboxylic acid.

1. temperaturewas refluxed for 1 h
2. filtrationThe precipitate was filtered off
3. washrinsed with water
4. customdried