反应详情

4-Amino-2-chloro-6,7-dimethoxyquinazoline (17.3 g), piperidine-4-acetic acid hydrochloride (12.0 g) and triethylamine (20 ml) in n-butanol (500 ml) were stirred under reflux for 20 hours. The mixture was then cooled to 0°-4° and the separated product collected. The solid was slurried with acetone (100 ml), filtered, slurried with chloroform (100 ml), filtered and washed with ether to give 4-amino-2-(4-carboxymethylpiperidino)-6,7-dimethoxyquinazoline hydrochloride (19.0 g). A sample was recrystallised from acetic acid and had an m.p. of 250°-252°.

1. temperatureunder reflux for 20 hours
2. temperatureThe mixture was then cooled to 0°-4°
3. customthe separated product collected
4. filtrationfiltered
5. filtrationfiltered
6. washwashed with ether