A One-Pot Synthesis of 2-Amino- and 2-(Arylamino)-Substituted Thiazoles and Selenazoles using [Hydroxy(tosyloxy)iodo]benzene, Carbonyl Compounds and Thioureas or Selenoureas: A Modification of the Hantzsch Synthesis
作者:Robert M. Moriarty、B. K. Vaid、M. P. Duncan、Stuart G. Levy、O. Prakash、S. Goyal
DOI:10.1055/s-1992-26243
日期:——
A one-pot synthesis of 4-substituted 2-amino- or 2-(arylamino)thiazoles has been achieved via treatment of ketones with [hydroxy(tosyloxy)iodo]benzene and thioureas in refluxing acetonitrile. 1,3-Dicarbonyl compounds yield (5-acyl-4-methylthiazol-2-yl)-ammonium tosylates and the corresponding selenazol-2-yl compounds, respectively, upon reaction with [hydroxy(tosyloxy)iodo]benzene followed by the addition of thiourea or selenourea. The tosylate salts are converted to the corresponding free bases by treatment with sodium bicarbonate. This synthesis is an important modification of the Hantzsch synthesis.
通过在回流乙腈中用[羟基(对甲苯磺酰氧基)碘]苯和硫脲处理酮,实现了 4-取代的 2-氨基或 2-(芳基氨基)噻唑的一步法合成。1,3-二羰基化合物与[羟基(对甲苯磺酰氧基)碘]苯反应,然后加入硫脲或硒脲,可分别生成(5-酰基-4-甲基噻唑-2-基)对甲苯磺酸盐铵盐和相应的硒唑-2-基化合物。经碳酸氢钠处理后,甲苯磺酸盐会转化为相应的游离碱。 这种合成方法是对汉茨合成法的重要改进。