The invention relates to a new multistage process for the production of 4-amino-6,7-dimethoxy-2-[4-(furo-2-yl)-piperazin-1-yl]-quinazoline corresponding to the following formula ##STR1## and physiologically compatible salts thereof, which gives better yields and uses less expensive and more reactive materials than known processes. The intermediate product formed in this process, N"-cyano-N'-(3,4-dimethoxyphenyl)-O-phenylisourea, shows antihypertensive activity on its own.
本发明涉及一种新的多级过程,用于生产与以下式子相对应的4-
氨基-6,7-二甲氧基-2-[4-(
呋喃-2-基)-
哌嗪-1-基]-
喹唑啉 ##STR1## 以及其生理兼容的盐,该过程比已知的过程产率更高,使用更便宜,更具反应性的材料。在此过程中形成的中间产物N"-
氰基-N'-(3,4-二
甲氧基苯基)-O-苯基异
脲,本身显示抗高血压活性。