4(3H)-Quinazolinone derivatives of formula (I) are provided. ##STR1## wherein R.sub.1 is a hydrogen atom, a C.sub.1 -C.sub.6 alkyl group, an aryl group, a substituted aryl group, or an aralkyl group; R.sub.2 is a C.sub.1 -C.sub.6 alkylamino group, a phenyl group, a substituted phenyl group, or a 5- or 6-membered heterocyclic group containing one or more N, O or S as a hetero atom or atoms, said heterocyclic group optionally being substituted or fused with a benzene ring; n is 1 or 2; or R.sub.2 represents a geranyl group or a dipyridylmethyl group together with the group --(CH.sub.2).sub.n --; and X is a hydrogen atom, a C.sub.1 -C.sub.6 alkyl group or a halogen atom, and pharmaceutically acceptable acid addition salts thereof. They are useful as antiulcer agents.
提供了一种式(I)的4(3H)-
喹唑啉酮衍
生物。 ##STR1## 其中R1是一个氢原子、C1-C6烷基、芳基、取代芳基或芳烷基;R2是C1-C6烷基
氨基、苯基、取代苯基或含有1个或多个N、O或S作为杂原子的5或6元杂环基团,该杂环基团可选择性地被取代或与苯环稠合;n是1或2;或者R2代表与-(
CH2)n-基团一起的橙花基或二
吡啶甲基;X是氢原子、C1-C6烷基或卤素原子,以及其药学上可接受的酸加成盐。它们作为抗溃疡剂是有用的。