Regioselectivity in the Reaction of 2‐Aminobenzothiazoles and 2‐Aminobenzimidazoles with Enaminonitriles and Enaminones: Synthesis of Functionally Substituted Pyrimido[2,1‐<i>b</i>][1,3]benzothiazole and Pyrimido[1,2‐<i>a</i>]benzimidazole Derivatives
作者:Abdulaziz Alnajjar、Mervat Mohammed Abdelkhalik、Hossam Mohammed Riad、Samia Mohammed Sayed、Kamal Usef Sadek
DOI:10.1002/jhet.3337
日期:2018.12
A variety of new polyfunctionally substituted benzo[d]pyrimido[2,1‐b][1,3]thiazole and benzo[4,5]imidazo[1,2‐a]pyrimidine derivatives have been synthesized. The general synthetic procedure used for this purpose involves the condensation of 2‐aminobenzothiazole and 2‐aminobenzimidazole with a variety of enaminonitriles, enaminones, and acrylaldehyde. The regioselectivity for initial attack of either
各种新的多官能取代的苯并[ d ]嘧啶基[2,1– b ] [1,3]噻唑和苯并[4,5]咪唑[1,2- a ]已经合成了]嘧啶衍生物。用于该目的的一般合成方法涉及2-氨基苯并噻唑和2-氨基苯并咪唑与各种烯氨基腈,烯胺和丙烯醛的缩合。研究并合理化了对环内环氮或环外氨基的初始进攻的区域选择性。可以得出结论,环氮是酸性介质中反应性最强的分子,也可以分离出环状中间体,这证明了环化后的结论。然而,在碱性或中性介质中,发现环外氨基是反应性最高的中心。尽可能通过元素分析,光谱数据和替代合成路线阐明了新合成化合物的所有结构。
De Cat; Van Dormael, Bulletin des Societes Chimiques Belges, 1951, vol. 60, p. 69,74
作者:De Cat、Van Dormael
DOI:——
日期:——
Chow et al., Journal of Heterocyclic Chemistry, 1973, vol. 10, p. 71
作者:Chow et al.
DOI:——
日期:——
Studies on Antiulcer Agents. III. Plausible Mechanism of Antisecretory Action of Ethyl 2-((1H-Benzimidazol-2-yl)sulfinylmethyl)-4-dimethylamino-5-pyrimidinecarboxylate, an H+/K+-ATPase Inhibitor, Based on Its Reaction with Thiols.
作者:Kohji TERASHIMA、Osamu MURAOKA、Masaru ONO
DOI:10.1248/cpb.43.1985
日期:——
hylidenamino]pyrimido[1,2-a]benzimid azole-3- carboxylate (6), instead of providing a disulfide of type 3, 2-(2-alkyldithiomethylpyridino)benzimidazolide, the product predicted to be formed according to the reaction mechanism of common H+/K(+)-ATPase inhibitors, such as omeprazole or lansoprazole, with mercaptans. With a large excess of 2-mercaptoethanol, 5 provided 2-(2-hydroxyethylthio)-1H-benzimidazole