Substituted acylpiperazinoquinazolines of formula I ##STR1## wherein n is 0 or 1, R represents an alkyl group with 1 to 4 carbon atoms or a benzyl group, and R.sub.1 is a hydrogen atom, a methyl group or a phenyl group. Addition salts of these compounds with inorganic and organic acids are also disclosed. The compounds possess a significant antihypertensive activity. They can be prepared by the reaction of 2-halogeno quinazoline derivatives with the corresponding acylpiperazines, followed (if required) by neutralization of the respective base with a suitable acid to form its pharmaceutically convenient addition salt. The acid addition salts, especially hydrochlorides, are readily soluble in water and give stable, almost neutral aqueous solutions which can be used in parenteral (injectable) and peroral medicinal dosage forms.
式I的取代酰基
哌嗪喹唑啉化合物##STR1##其中n为0或1,R代表具有1至4个碳原子的烷基或苄基,R.sub.1为氢原子、甲基或苯基。还披露了这些化合物与无机和有机酸的加成盐。这些化合物具有显著的降压活性。它们可以通过2-卤代
喹唑啉衍
生物与相应的酰基
哌嗪反应制备,随后(如有必要)通过用适当酸中和相应碱来形成其药学上方便的加成盐。酸加成盐,特别是盐酸盐,在
水中易溶且形成稳定、几乎中性的
水溶液,可用于肌注和口服药物剂型。