Approach for 2-(arylthio)imidazoles and imidazo[2,1-b]thiazoles from imidazo[2,1-b][1,3,4]thiadiazoles by ring-opening and -reconstruction
作者:Benyi Shi、Zhouhe Zhu、Yi-Shuo Zhu、Dagang Zhou、Jinyuan Wang、Panpan Zhou、Huanwang Jing
DOI:10.1039/c6ob00102e
日期:——
synthesis of imidazo[2,1-b]thiazole derivatives has been developed and proceeds via a ring-opening and ring-closing reconstruction of imidazo[2,1-b][1,3,4]thiadiazoles with phenylacetylene in the presence of potassium tert-butoxide (t-BuOK) under very mild reaction conditions. A proposed mechanism is calculated computationally using a DFT method at the B3LYP/6-31+G(d,p) level. The imidazo[2,1-b][1,3,4]thiadiazoles
咪唑并[2,1- b ]噻唑衍生物的高效一锅合成已得到开发,并通过咪唑并[2,1- b ] [1,3,4]噻二唑的开环和闭环重构而进行在非常温和的反应条件下,在叔丁醇钾(t -BuOK)存在下,用苯乙炔与苯乙炔 在B3LYP / 6-31 + G(d,p)级别上使用DFT方法以计算方式计算了一种建议的机制。咪唑并[2,1- b ] [1,3,4]噻二唑也成功地转化为一系列的2-(芳硫基)-1 H-咪唑,使用的是芳基卤化物和乙酰丙酮铜(II)(Cu( acac)2)在微波辐射条件下作为催化剂。这些反应的关键特征是使用现成的试剂,操作简单,方便地使用新的杂环合成子以及具有功能基团相容性的多种底物。