Transformations of 5-(2-arylethynyl)-2-methyl-2H-tetrazoles under superelectrophilic activation
作者:Dmitry S. Ryabukhin、Anna D. Lisakova、Anna S. Zalivatskaya、Irina A. Boyarskaya、Galina L. Starova、Rostislav E. Trifonov、Vladimir A. Ostrovskii、Aleksander V. Vasilyev
DOI:10.1016/j.tet.2018.02.050
日期:2018.4
les (acetylene tetrazoles) with arenes under the action of Brønsted superacid CF3SO3H or acidic zeolite HUSY CBV-720 gives rise to E-/Z-5-(2,2-diarylethenyl)-2-methyl-2H-tetrazoles, as products of hydroarylation of acetylene bond, in yields up to 98% with predominant formation of E-isomers. Cationic intermediates of these reactions have been studied theoretically by DFT calculations. Addition of CF3SO3H
5-芳基乙炔基-2-甲基-2 H-四唑(乙炔四唑)在布朗斯台德超强酸CF 3 SO 3 H或酸性沸石HUSY CBV-720的作用下与芳烃反应,生成E- / Z -5-(2作为乙炔键加氢芳基化的产物,(2-二芳基乙烯基)-2-甲基-2 H-四唑的产率高达98%,主要形成E-异构体。这些反应的阳离子中间体已通过DFT计算从理论上进行了研究。将CF 3 SO 3 H加到乙炔四唑的三键上可以高产率得到相应的E- / Z-乙烯基三氟甲磺酸酯。这些四唑在H中的三键水合2 SO 4导致形成5-(2-芳基-2-氧代乙基)-2-甲基-2 H-四唑。酸(CF 3 SO 3 H或AlCl 3)-芳烃-环己烷体系中乙炔四唑的串联加氢芳基化-离子加氢得到5-(2,2-二芳基乙基)-2-甲基-2 H-四唑。