Novel benzologs or pyrazolo-quinazoline derivatives of the formula (I) ##STR1## wherein X and Y are independently selected from oxygen, sulphur and imino and wherein ring (C) is a pyrazole ring fused to ring (B) via one of the three ortho positions or sides of ring (B); the fused pyrazole ring (C) is either in the 4,3- or the 3,4-arrangement; and tautomers of formula (I) compounds; when X is not oxygen, i.e. stands for sulphur or imino, Y may stand for a covalent bond that links the hydrogen directly to the carbon atom in position 2. Two methods for producing the novel formula (I) compounds are disclosed. The first or indazole method starts from a precursor having a benzene moiety (ring B) and a pyrazolo moiety (ring C) fused therewith, i.e. the indazole structure; ring (B) carries two vicinal substituents for forming the pyrimidine moiety or ring (A) by cyclization. The second or quinazoline method starts from a precursor having the pyrimidine moiety (A) and the benzene moiety (B) fused therewith, i.e. the quinazoline structure, and carrying two vicinal substituents for forming the pyrazole moiety (C) by cyclization. The first method, in addition to yielding the novel benzologs, provides for improved synthesis of previously disclosed benzo-allopurinols. Novel compounds of formula (I) are benzologs of such well known and biologically active compounds as oxipurinol, aminopurinol and thiopurinol and are expected to be applicable for comparable pharmaceutical purposes.
式(I)的新型苯并环化合物或
吡唑喹唑啉衍
生物,其中X和Y独立地从氧、
硫和
亚胺中选择,环(C)是通过环(B)的三个邻位或侧面之一融合到
吡唑环的一个
吡唑环;融合的
吡唑环(C)处于4,3-或3,4-排列;式(I)化合物的互变异构体;当X不是氧时,即代表
硫或
亚胺时,Y可以代表一个共价键,将氢直接连接到位于位置2的碳原子。揭示了两种制备新式(I)化合物的方法。第一种或
吲哚唑方法从具有苯环(B)和融合有
吡唑环(C)的前体开始,即
吲哚唑结构;环(B)带有两个邻位取代基,通过环化形成
嘧啶基或环(A)。第二种或
喹唑啉方法从具有
嘧啶基(A)和苯环(B)融合的前体开始,即
喹唑啉结构,并带有两个邻位取代基,通过环化形成
吡唑基(C)。第一种方法除了产生新型苯并环化合物外,还提供了改进的先前披露的苯并已
嘌呤合成的方法。式(I)的新型化合物是氧
嘧啶、
氨基
嘌呤和
硫嘌呤等已知的
生物活性化合物的苯并环化合物,预计可应用于类似的药物目的。