Regioselective electrophilic cyclization of o-ethynylbenzyl phenyl selenides to (Z)-1-methylidene-2-phenyl-1,3-dihydro-1H-benzo[c]selenophenium salts
作者:Haruki Sashida、Shoko Nakabayashi、Hirokazu Suzuki、Mamoru Kaname、Mao Minoura
DOI:10.1016/j.tetlet.2010.07.160
日期:2010.10
to afford the (Z)-1-methylidene-2-phenyl-1,3-dihydro-1H-benzo[c]selenophenium salts as the major products during the 5-exo-dig mode cyclization in good yields together with minor E isomers. The structure of the major (Z)-selenophenium salt was established by the single crystal X-ray crystallographic analysis using a tert-butyl derivative.
邻乙炔基苄基苯基硒化物与三氟甲磺酸区域选择性反应,生成(Z)-1-亚甲基-2-苯基-1,3-二氢-1 H-苯并[ c ]硒代苯酚盐,为5-exo-期间的主要产物dig模式环化以及少量的E异构体,收率很高。通过使用叔丁基衍生物的单晶X射线晶体学分析确定了主要的(Z)-硒烯鎓盐的结构。