Compounds of the formula ##STR1## wherein R.sup.12 is a leaving group, Z is S, O or CH.sub.2 and A is a phenyl, furyl, thienyl or pyridyl ring substituted by a ##STR2## moiety, in which R.sup.8 and R.sup.9 are various substituents or, when taken together with the nitrogen, may be a specified heterocyclic ring, are intermediates in the preparation of histamine H.sub.2 -antagonist anti-ulcer agents of the formula ##STR3## in which R.sup.1 and R.sup.2 are any of several specified substituents.
化合物的公式为##STR1##其中R.sup.12是一个离去基团,Z是S,O或CH.sub.2,而A是一个被##STR2##基团取代的苯基,
呋喃基,
噻吩基或
吡啶环,其中R.sup.8和R.sup.9是不同的取代基,或者与氮一起可以是一个特定的杂环环。这些化合物是制备
组织胺H.sub.2-拮抗剂抗溃疡剂的中间体,该抗溃疡剂的公式为##STR3##其中R.sup.1和R.sup.2是几个指定的取代基之一。