Compounds are described of the formula ##STR1## in which R.sup.1 is COOR.sup.5, CONHR.sup.5, cyano, 5-tetrazolyl or 5-tetrazolylaminocarbonyl, where R.sup.5 is hydrogen or C.sub.1-6 alkyl; R.sup.2 is hydrogen or C.sub.1-6 alkyl; R.sup.3 is a group of the formula R.sup.6 --(Z).sub.m -- where m is O or 1, Z is O, S, SO, SO.sub.2 or CO, and R.sup.6 phenyl optionally substituted by one or more group selected from halogen, C.sub.1-4 alkyl, C.sub.3-6 cycloalkyl, C.sub.1-4 alkoxy, benzyloxy, hydroxy, nitro, C.sub.1-4 alkylthio, C.sub.1-4 alkylsulphinyl, C.sub.1-4 alkylsulphonyl, amino and NHR.sup.7 where R.sup.7 is C.sub.2-6 acyl; and R.sup.4 is hydrogen, C.sub.1-6 alkyl or halogen; and salts thereof. These compounds have pharmaceutical properties and in particular are useful in the treatment of immediate hypersensitivity conditions such as asthma.
化合物的结构式为##STR1##其中R.sup.1为COOR.sup.5,CONHR.sup.5,
氰基,5-
四唑基或5-
四唑基
氨基甲酰基,其中R.sup.5为氢或C.sub.1-6烷基;R.sup.2为氢或C.sub.1-6烷基;R.sup.3为式R.sup.6-(Z).sub.m-的基团,其中m为O或1,Z为O、S、SO、SO.sub.2或CO,R.sup.6为苯基,可选地取代一个或多个基团,所述基团选自卤素、C.sub.1-4烷基、C.sub.3-6环烷基、C.sub.1-4烷氧基、苄氧基、羟基、硝基、C.sub.1-4烷
硫基、C.sub.1-4烷基亚磺基、C.sub.1-4烷基磺酰基、
氨基和NHR.sup.7,其中R.sup.7为C.sub.2-6酰基;R.sup.4为氢、C.sub.1-6烷基或卤素;以及其盐。这些化合物具有药理特性,特别是在治疗哮喘等即时超敏反应疾病方面有用。