Highly fluorinated 2,3-dihydro-1,3,4-thiadiazole derivatives via [3+2]-cycloadditions of tertiary thioamides with nitrile imines derived from trifluoroacetonitrile
作者:Greta Utecht-Jarzyńska、Sergiy S. Mykhaylychenko、Eduard B. Rusanov、Yuriy G. Shermolovich、Marcin Jasiński、Grzegorz Mlostoń
DOI:10.1016/j.jfluchem.2020.109702
日期:2021.2
derivatives were formed in a fully regioselective manner in high yields. In a competition experiment, the non-fluorinated 1-(morpholin-4-yl)ethanethione was shown to be more reactive towards a model nitrile imine than its 2,2,2-trifluoromethylated analogue.
富氟的1,3,4-噻二唑衍生物是通过将原位生成的N-芳基-三氟乙腈亚胺与叔多氟链烷硫基酰胺(N,N-二烷基硫代酰胺)进行1,3-偶极环加成制备的。在室温下于温和条件下于THF溶液中进行反应。1,3,4-噻二唑衍生物以完全区域选择性的方式高产率形成。在竞争实验中,未氟化的1-(吗啉-4-基)乙硫酮对模型腈亚胺的反应性高于其2,2,2-三氟甲基化类似物。