Tandem addition–cyclization of o-ethynylphenyllithiums and isoselenocyanates: a convenient preparation of functionalized benzo[c]selenophenes
作者:Mamoru Kaname、Haruki Sashida
DOI:10.1016/j.tetlet.2011.04.057
日期:2011.6
producing the desired (Z)-3-methylidenebenzo[c]selenophenes as the sole 5-exo-dig mode cyclization products in one-pot with yields ranging from 54–87%. The iodocyclization of the o-ethynylphenyllithium with isoselenocyanate stereoselectively gave the (E)-1′-iodo-3-methylidenebenzo[c]selenophene, which was converted into the more functionalized benzo[c]selenophenes via the Suzuki- and Sonogashira-coupling
用叔丁基锂在Et 2 O中对邻溴乙炔基苯进行锂化,然后用异壬酸异氰酸酯处理,然后添加EtOH作为质子源,产生所需的(Z)-3-亚甲基苯并[ c ]硒代苯并作为唯一的5-exo一锅法深度挖掘模式环化产物,产率为54–87%。所述的iodocyclization ö -ethynylphenyllithium与isoselenocyanate立体选择性地得到(ê)-1'-碘-3- methylidenebenzo [ Ç ]硒吩,将其转变为更具官能苯并[ C ^ ]硒吩经由Suzuki-和的Sonogashira偶联反应。