Heterocyclic compounds represented by the general formula (I) and having elastase inhibiting activity; and intermediates for the synthesis thereof: (I) wherein R
1
is a heterocyclic group represented by the general formula (II): (II) [wherein A represents the presence or absence of a benzene ring; X is oxygen, sulfur or NH; and Y is nitrogen or CH], and the heterocyclic group may be substituted with one to three substituents which may be the same or different and are selected from the group consisting of lower alkyl, lower alkoxy, and phenyl which may be substituted with optionally halogenated lower alkyl, lower alkoxy or halogeno; and R
2
and R
3
are each hydrogen or hydroxyl, or R
2
and R
3
may be united to form an oxo group, with the proviso that both are not hydrogen.
                            由通式(I)表示并具有
弹性蛋白酶抑制活性的
杂环化合物及其合成中间体: (I) 其中 R
1
是通式(II)代表的杂环基团: (II) [其中 A 代表存在或不存在苯环;X 是氧、
硫或 NH;Y 是氮或 CH],杂环基团可被一至三个取代基取代,这些取代基可以相同或不同,选自下烷基、下烷氧基和苯基组成的组,苯基可被任选卤代的下烷基、下烷氧基或卤代物取代;以及 R
2
和 R
3
均为氢或羟基,或 R
2
和 R
3
可结合成一个氧代基团,但两者均不得为氢。