Study on halogen promoted cyclization of
<scp>2‐alkynylthiobenzimidazoles</scp>
作者:Indrė Misiūnaitė、Rita Bukšnaitienė、Justas Pošiūnas、Algirdas Brukštus、Ieva Žutautė
DOI:10.1002/jhet.4499
日期:2022.10
Electrophile promoted nucleophilic cyclization of 2-alkynylthiobenzimidazoles was investigated. N-halosuccinimides were chosen as electrophile source in formation of substituted benzimidazo[2,1-b]thiazoles and benzimidazo[2,1-b][1,3]thiazines. Reaction pathway via 6-endo-dig or 5-exo-dig cyclization of substrates depended on substituents to the alkyne moiety, though with bromine electrophile in some
研究了亲电促进的 2-炔基硫代苯并咪唑的亲核环化。N-卤代琥珀酰亚胺被选为取代苯并咪唑[2,1-b]噻唑和苯并咪唑[2,1-b][1,3]噻嗪的亲电子源。通过底物的 6- endo -dig 或 5 - exo -dig 环化的反应途径取决于炔烃部分的取代基,尽管在某些情况下溴亲电子试剂占主导地位的炔烃和芳族取代反应。在 2-(丙炔硫基)甲基苯并咪唑中具有延长连接的化合物仅形成 7 - endo -dig 产物。