Novel carbostyril derivatives and their salts having antihistaminic effects and are useful as antihistaminic agents, represented by the general formula (1), ##STR1## wherein R.sup.1 is a hydrogen atom, a lower alkenyl group, a lower alkynyl group or a lower alkyl group which may have phenyl group(s) as the substituted group(s); R.sup.2 is a hydrogen atom, a lower alkyl group or a phenyl group; R.sup.3 is a lower alkyl group having phenyl group(s) as the substituted group(s), or a phenyl group which may have 1 to 3 substituted groups selected from the group consisting of halogen atoms, lower alkyl groups and lower alkoxy groups; R.sup.4 is a hydrogen atom, a hydroxyl group or a lower alkanoyl group; X is a halogen atom; Y is a lower alkylene group which may have hydroxyl group(s) as the substituent(s); n is 0, 1 or 2; the carbon-carbon bond between 3- and 4-positions in the carbostyril skeleton is a single or double bond; provided that when R.sup.3 is a lower alkyl group having phenyl group(s) as the substituted group(s), then R.sup.4 should be neither a hydroxyl group nor a lower alkanoyl group.
具有抗
组胺作用并可用作
抗组胺药物的新型碳基
苯并咪唑衍
生物及其盐,由一般式(1)表示,其中R1是氢原子,较低的烯基基团,较低的炔基基团或较低的烷基基团,该基团可以具有苯基取代基; R2是氢原子,较低的烷基基团或苯基; R3是具有苯基取代基的较低烷基基团或可以具有来自卤素原子,较低烷基基团和较低烷氧基团的1到3个取代基的苯基; R4是氢原子,羟基或较低的烷酰基基团; X是卤素原子; Y是较低的烷基烯基基团,该基团可以具有羟基取代基; n为0、1或2; 碳-碳键在碳基
苯并咪唑骨架的3-和4-位置之间是单键或双键; 假设当R3是具有苯基取代基的较低烷基基团时,R4既不应是羟基也不应是较低的烷酰基基团。