Pd/phenanthroline-catalyzed arylative cyclization of o-(1-alkynyl)thioanisoles: synthesis of 3-arylated benzo[b]thiophenes
作者:Takayuki Yamauchi、Fumitoshi Shibahara、Toshiaki Murai
DOI:10.1016/j.tetlet.2016.05.033
日期:2016.7
aryl iodides in the presence of catalytic amounts of [Pd(phen)2][PF6]2 resulted in the efficient formation of 3-arylated benzo[b]thiophenes, and a range of aryl iodides with electron-donating or -withdrawing groups could be used. While this reaction proceeded in the presence of aromatic and aliphatic groups on the terminal alkynyl carbon atom, silyl and alkoxycarbonyl groups hampered the reaction. Furthermore
在催化量的[Pd(phen)2 ] [PF 6 ] 2存在下,邻-(1-炔基)硫代苯甲醚与芳基碘的芳基环化反应可有效形成3-芳基苯并[ b ]噻吩可以使用一定范围的带有给电子或吸电子基团的芳基碘化物。尽管该反应在末端炔基碳原子上存在芳族和脂族基团的情况下进行,但是甲硅烷基和烷氧基羰基基团阻碍了反应。此外,该方法可扩展到由N,N-二甲基-o合成3芳基吲哚-(1-炔基)苯胺。所有这些反应都通过裂解碳-杂原子键而顺利进行。除所需的环化产物外,在硫原子上使用邻-(羟丙基)苯基甲基取代基提供了异色满,其应通过羟基分子内攻击苄基碳原子而形成。