1-Arylaminoimidazole-2-thiones as intermediates in the synthesis of imidazo[2,1-b][1,3,4]thiadiazines
作者:Constantinos Neochoritis、Constantinos A. Tsoleridis、Julia Stephanidou-Stephanatou
DOI:10.1016/j.tet.2008.01.136
日期:2008.4
The synthesis of the hitherto unknown imidazo[2,1-b][1,3,4]thiadiazines 7 in good to very good yields (up to 77%) by using suitable imidazole-2-thione precursors 1 has been described, while S-vinylimidazoles 8 and 9 were isolated as by-products. Moreover, the reactivity of the three possible reaction sites of the starting thiones 1 was initially examined by methylation experiments, whereupon the enhanced
已经描述了通过使用合适的咪唑-2-硫酮前体1合成迄今未知的咪唑并[2,1- b ] [1,3,4]噻二嗪7的收率非常好(高达77%)。分离出S-乙烯基咪唑8和9作为副产物。此外,最初通过甲基化实验检查了起始硫酮1的三个可能反应位点的反应性,随后通过分离甲基化衍生物3和4证明了硫的反应性增强。通过长时间的甲基化,咪唑啉酮6终于形成了。理论计算支持了烷基化产物的实验结果。
Direct Synthetic Approach to N-Substituted 1-Amino-2,3-dihydro-1H-imidazole-2-thiones
作者:Joachim G. Schantl、Irene M. Lagoja
DOI:10.3987/com-96-7715
日期:——
Sequential MCR via Staudinger/Aza-Wittig versus Cycloaddition Reaction to Access Diversely Functionalized 1-Amino-1H-Imidazole-2(3H)-Thiones
作者:Cecilia Ciccolini、Giacomo Mari、Gianfranco Favi、Fabio Mantellini、Lucia De Crescentini、Stefania Santeusanio
DOI:10.3390/molecules24203785
日期:——
the known cycloaddition reaction, towards variously substituted 1-amino-1H-imidazole-2(3H)-thione derivatives has been successfully developed. The novel approach involves α-halohydrazones whose azidation process followed by tandem Staudinger/aza-Wittig reaction with CS2 in a sequential MCR regioselectively leads to the target compounds avoiding the formation of the regioisomer iminothiazoline heterocycle