The invention concerns a bicyclic heterocyclic compound of the formula I ##STR1## wherein Q is an optionally substituted 10-membered bicyclic heterocyclic moiety containing 1 or 2 N's and a further O or S heteroatom; A.sup.1 is a direct link to X.sup.1 or (1-3C)alkylene; X.sup.1 is oxy, thio, sulphinyl, sulphonyl or imino; Ar is optionally substituted phenylene or pyridylene; R.sup.1 is (1-4C)alkyl, (3-4C)alkenyl or (3-4C)alkynyl; and R.sup.2 and R.sup.3 together form a group of the formula --A.sup.2 --X.sup.2 --A.sup.3 -- which, together with the carbon atom to which A.sup.2 and A.sup.3 are attached, defines a ring having 5 to 7 ring atoms, wherein each of A.sup.2 and A.sup.3 is (1-3C)alkylene and X.sup.2 is oxy, thio, sulphinyl or sulphonyl; or a pharmaceutically-acceptable salt thereof. The compounds of the invention are inhibitors of the enzyme 5-lipoxygenase.
本发明涉及一种公式I的双环
杂环化合物:##STR1## 其中,Q是含有1或2个N和另一个O或S杂原子的可选取代的10元双环杂环基;A.sup.1是直接连接到X.sup.1或(1-3C)烷基;X.sup.1是氧、
硫、亚磺酰基、磺酰基或
亚胺基;Ar是可选取代的苯基或
吡啶基;R.sup.1是(1-4C)烷基、(3-4C)烯基或(3-4C)炔基;R.sup.2和R.sup.3共同形成一个公式--A.sup.2--X.sup.2--A.sup.3--的基团,其中A.sup.2和A.sup.3均为(1-3C)烷基,X.sup.2为氧、
硫、亚磺酰基或磺酰基;或其药学上可接受的盐。本发明的化合物是5-脂氧合酶酶的
抑制剂。