Thiazine derivatives of the formula [I]: ##STR1## wherein R.sup.1 and R.sup.2 are both H or form a naphthalene ring together with the benzene ring; R.sup.3 and R.sup.4 are both H, or one of them is halogen and another is H; X is S or O; R.sup.5 and R.sup.6 are each i) H, ii) lower alkyl, iii) cycloalkyl, iv) substituted phenyl, v) naphthyl, vi) lower alkyl which is substituted by substituted or unsubstituted phenyl, or vii) S-containing heterocyclic group; one of Z.sup.1 and Z.sup.2 is O and another is H.sub.2 ; A is lower alkylene; R.sup.7 and R.sup.8 are each i) H, ii) lower alkyl, iii) lower alkenyl, iv) lower alkynyl, or v) lower alkyl which is substituted by substituted or unsubstituted phenyl, or both form together N-containing heterocyclic group; provided that when both of R.sup.1 and R.sup.2 are H, Z.sup.2 is O and either one of R.sup.5 and R.sup.6 is substituted phenyl, naphthyl or S-containing heterocyclic group, or their salts, which have calcium antagonistic activity within the cerebral tissues and are useful for prophylaxis and treatment of ischemic encephalopathia and/or cerebral neurocyte dyscrasia, and process for preparing said compounds.
式[I]的
噻嗪衍
生物:其中R.sup.1和R.sup.2均为H或与苯环形成
萘环;R.sup.3和R.sup.4均为H,或其中一个为卤素,另一个为H;X为S或O;R.sup.5和R.sup.6分别为i) H,ii)低烷基,iii)环烷基,iv)取代苯基,v)
萘基,vi)被取代或未取代苯基取代的低烷基,或vii)含S的杂环基;Z.sup.1和Z.sup.2中的一个为O,另一个为H.sub.2;A为低烷基;R.sup.7和R.sup.8分别为i) H,ii)低烷基,iii)低烯基,iv)低炔基,或v)被取代或未取代苯基取代的低烷基,或两者一起形成含N的杂环基;但当R.sup.1和R.sup.2均为H,Z.sup.2为O且R.sup.5和R.sup.6中的任意一个为取代苯基、
萘基或含S的杂环基时,或其盐,其在脑组织内具有
钙拮抗活性,对缺血性脑病和/或脑神经细胞异常的预防和治疗有用,并提供制备该化合物的过程。