Chemical switching in reaction behavior of azine: Synthesis of a novel thienodiazepine derivative
作者:Kaoru Ohtake、Jyunpei Tsuda、Kazuhiko Takatori、Shinji Nagumo、Eiko Yasui
DOI:10.1016/j.tetlet.2021.153043
日期:2021.5
We previously have reported that an acid-promoted condensation of a hydrazonoester derived from phenylalanine afforded an azine which was converted to a pyrrole through 3 steps: isomerization to dienamine, [3,3]-sigmatropic rearrangement, and cyclization. In this study, reaction behavior of the intermediate proved to be switched depending on the type of the aromatic ring. Hydrazonoesters derived from
我们以前曾报道过,苯丙氨酸衍生的肼基甲酸酯的酸促进缩合反应生成的嗪通过3个步骤转化为吡咯:异构化为二烯胺,[3,3]-σ重排和环化。在这项研究中,中间体的反应行为被证明取决于芳环的类型。衍生自噻吩丙氨酸的羟基酯在热酸性条件下提供了各种噻二氮杂卓衍生物。在异构化为二烯胺之前,反应性更高的噻吩环可能会发生Friedel-Crafts反应。