Brønsted/Lewis Acid-Promoted Site-Selective Intramolecular Cycloisomerizations of Aryl-Fused 1,6-Diyn-3-ones for Diversity-Oriented Synthesis of Benzo-Fused Fluorenes and Fluorenones and Naphthyl Ketones
作者:Mou Mandal、Shanmugam Sakthivel、Rengarajan Balamurugan
DOI:10.1021/acs.joc.0c02131
日期:2021.1.1
intramolecular cyclization of aryl-fused 1,6-diyn-3-ones. Synthesis of benzo[a]fluorenes and naphthyl ketones has been achieved selectively using TfOH and AgBF4, respectively, via in situ-formed acetals. Aryl-fused 1,6-diyn-3-ones undergo triflic acid-mediated intramolecular cyclization, leading to benzo[b]fluorenone derivatives via a radical intermediate as supported by EPR studies. Kinetic studies
本文中,通过芳基稠合的1,6-二炔-3-酮的位点选择性分子内环化,已经证明了一种容易的以多样性为导向的方法来接近官能化的苯并[ a ]芴,苯并[ b ]芴酮和萘基酮。分别使用TfOH和AgBF 4分别通过原位形成的缩醛选择性地完成了苯并[ a ]芴和萘基酮的合成。芳基稠合的1,6-二炔-3-酮经历三氟甲磺酸-介导的分子内环化,从而导致苯并[ b ]芴酮衍生物通过EPR研究支持的基本中间体。还通过紫外可见光谱分析对这些转变进行了动力学研究,以阐明反应概况。