Compounds of formula (I) ##STR1## wherein R is an alkyl group; R.sub.1 is a cyano, carboxy, alkoxycarbonyl or hydroxylaminocarbonyl group; R.sub.2 is substituted or unsubstituted phenyl (C.sub.3 -C.sub.7)-cycloalkyl, .alpha.-, .beta.- or .gamma.-pyridyl or a benzoheteroxcyclic ring; R.sub.3 is carboxy or carboalkoxy; Y is a group of the formula --COOX; --NHCOA; --NCO; --COA; --CONHOR.sub.e ; --OCOA; A; --COCH.sub.2 COR.sub.f ; --NHCSA; --OCSA; (a); X is hydrogen, alkyl or succinimidyl group; A is a cyclic or acyclic amino group; and n is 1 or 2; having pharmacological characteristics which render them useful in the treatment of inflammatory conditions of the respiratory tract and asthmatic conditions.
化合物的结构式(I)如下:其中R是烷基基团;R.sub.1是
氰基、羧基、烷氧羰基或
羟胺羰基基团;R.sub.2是取代或未取代的苯基(C.sub.3-C.sub.7)-环烷基、α-、β-或γ-
吡啶基或苯并杂环戒;R.sub.3是羧基或羧烷氧基;Y是--COOX;--NHCOA;--NCO;--COA;--CONHOR.sub.e;--OCOA;A;--COCH.sub.2COR.sub.f;--NHCSA;--OCSA;(a)的基团;X是氢、烷基或琥珀
酰亚胺基团;A是环状或非环状
氨基团;n为1或2;具有药理特性,可用于治疗呼吸道炎症和哮喘病症。