Products of the nitration of 2-thiazolylureas and 2-thiazolylthioureas.
作者:REIKO YODA、YUICHI YAMAMOTO、TOMOKO OKADA、YOSHIKAZU MATSUSHIMA、YOICHI IITAKA
DOI:10.1248/cpb.32.3483
日期:——
Products of the nitration of 2-thiazolylurea and 2-thiazolylthiourea derivatives with fuming nitric acid in concentrated sulfuric acid are described. The urea derivatives studied were 3-(4-methyl-2-thiazoly) urea and -thiourea (7), and their l-methyl (1 and 2, respectively) and 1, 1-dimethyl analogs. The products were the compounds nitrated at the 5-position of the thiazole moiety. With an excess of nitric acid, 1-methyl-3-(4-methyl-5-nitro-2-thiazolyl)-1-nitrourea was obtained from 1, while the corresponding 1-nitrosourea was formed from 2. A pale yellow compound was obtained from the nitration of 7. Unlike other nitrated thioureas, it did not form a colored Cu (II) chelate and was stable to acid, alkali, and heat. It was concluded to be 6-methyl-2-nitroiminothiazolo [3, 2-b] [1, 2, 4] thiadiazole from studies of its physicochemical properties, chemical reactions, and the results of X-ray crystallography. Corresponding compounds were obtained from other N-(4-alkyl-2-thiazolyl) thioureas.
报道了2-噻唑基脲和2-噻唑基硫脲衍生物在浓硫酸中与发烟硝酸的硝化产物。研究的脲衍生物为3-(4-甲基-2-噻唑基)脲和硫脲(7)及其1-甲基(分别为1和2)和1,1-二甲基类似物。产物是噻唑部分的5-位发生硝化的化合物。当硝酸过量时,从1得到1-甲基-3-(4-甲基-5-硝基-2-噻唑基)-1-硝基脲,而从2得到相应的1-亚硝基脲。硝化7得到一种淡黄色化合物。与其他硝化硫脲不同,它不形成有色Cu(II)螯合物,且对酸、碱和热稳定。根据其物理化学性质、化学反应和X射线晶体学结果,推断为6-甲基-2-硝亚氨基噻唑并[3,2-b][1,2,4]噻二唑。从其他N-(4-烷基-2-噻唑基)硫脲也得到了相应的化合物。