The present invention provides compounds of formula (2):-
and their pharmaceutically acceptable salts which are useful as histamine H1-antagonists. In formula (2)
R1 is halogen, nitro, amino (or a pharmaceutically acceptable derivative of the amino group which is convertible in vivo into amino) or C1-4 alkyl;
R2 is halogen, nitro, amino (or a pharmaceutically acceptable derivative of the amino group which is convertible in vivo into amino), C1-4 alkyl or C3-4 alkoxy;
R3 is a C1-4 alkylene group; and
R4 is phenyl optionally bearing one or two substituents which are the same or different and are halogen, hydroxy, Cl.4 alkyl or C1-4 alkoxy or a methylene-dioxy group.
本发明提供了可用作
组胺 H1-拮抗剂的式 (2)
及其药学上可接受的盐类,可用作
组胺 H1 拮抗剂。式(2)中
R1 是卤素、硝基、
氨基(或可在体内转化为
氨基的
氨基的药学上可接受的衍
生物)或 C1-4 烷基;
R2 是卤素、硝基、
氨基(或可在体内转化为
氨基的
氨基的药学上可接受的衍
生物)、C1-4 烷基或 C3-4 烷氧基;
R3 是 C1-4 亚烷基;以及
R4 是苯基,可选择带有一个或两个相同或不同的取代基,它们是卤素、羟基、Cl.4 烷基或 C1-4 烷氧基或亚甲基二氧基。