Studies of heterocyclic compounds. IX. The synthesis and the properties of thiazolo[3,2-b]pyridazin-4-ium perchlorates.
作者:KIICHI ARAKAWA、TADASHI MIYASAKA、KAZUE SATOH
DOI:10.1248/cpb.25.299
日期:——
Eleven 6-methyl- and 6-phenyl-thiazolo [3, 2-b] pyridazin-4-ium perchlorates (I) are synthesized by acid-cyclization of the corresponding ketosulfides (VI) and thioacetonitriles (VII) which are prepared from 6-methyl-and 6-phenyl-pyridazine-3 (2H) thiones (IVa, b) by alkylation with α-haloketones (V) and α-chloroacetonitrile, respectively. Treatment of the quarternary salts (I) with potassium hydroxide or secondary amines furnishes 2-(2-mercaptovinyl) pyridazine-3 (2H)-ones (XII), nucleophilic attack of the hydroxide ion taking place at the C8a-position of the thiazolo [3, 2-b] pyridazinium system.
通过相应的酮硫化物 (VI) 和硫代乙腈 (VII) 的酸环化合成了 11 种 6-甲基-和 6-苯基-噻唑并 [3, 2-b] 哒嗪-4-鎓高氯酸盐 (I),其由 6 制备-甲基-和6-苯基-哒嗪-3(2H)硫酮(IVa,b)分别用α-卤代酮(V)和α-氯乙腈进行烷基化。用氢氧化钾或仲胺处理季盐(I),得到2-(2-巯基乙烯基)哒嗪-3(2H)-酮(XII),氢氧根离子的亲核攻击发生在噻唑并的C8a位[3, 2-b] 哒嗪鎓系统。