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。
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。
Base-Catalyzed Cyclization of 1,6-Diynyl Carboxylates Involving Propargyl-Allenyl Isomerization: Efficient Synthesis of Benzo[<i>b</i>]fluorene and Its Analogues
作者:Ning Sun、Xin Xie、Gaonan Wang、Haoyi Chen、Yuanhong Liu
DOI:10.1002/adsc.201601074
日期:2017.4.17
An efficient protocol for the synthesis of benzo[b]fluorenes via base‐catalyzed cyclization of 1,6‐diynyl carbonates, esters or ethers has been developed. The reaction likely proceeds via base‐induced propargyl‐allenyl isomerization followed by Schmittel‐type cyclization. Heterocycle‐fused fluorenes such as thiophene‐ or pyridine‐fused substrates could also be conveniently constructed by this method
已开发出一种通过碱催化的1,6-二炔基碳酸酯,酯或醚的环化反应合成苯并[ b ]芴的有效方案。该反应可能是通过碱诱导的炔丙基-烯基异构化,然后是施密特尔型环化而进行的。杂环融合的芴,例如噻吩或吡啶融合的底物也可以通过这种方法方便地构建。该反应的合成效用通过最多制备七环稠合多环芳烃得到了证明。
Gold-Catalyzed Cyclization of 1,6-Diyne-4-en-3-ols: Stannyl Transfer from 2-Tributylstannylfuran Through Au/Sn Transmetalation
作者:Yifeng Chen、Ming Chen、Yuanhong Liu
DOI:10.1002/anie.201201523
日期:2012.6.18
Gold‐tinted: A gold catalyzed cyclization reaction of 1,6‐diyne‐4‐en‐3‐ols, incorporating an in situ stannyltransfer reaction involving 2‐tributylstannylfuran, gives synthetically valuable 2‐stannylnaphthalenes (see scheme; DCE=dichloroethane). A gem‐diaurated furan complex, was isolated and fully characterized by X‐ray crystallographic analysis, and provides strong evidence for a tin to gold transmetalation
Gold-Catalyzed Cascade Friedel-Crafts/Furan-Yne Cyclization/Heteroenyne Metathesis for the Highly Efficient Construction of Phenanthrene Derivatives
作者:Yifeng Chen、Guijie Li、Yuanhong Liu
DOI:10.1002/adsc.201000644
日期:2011.2.11
A rapid access to highly substituted phenanthrenyl ketones through gold-catalyzedcyclization of 1,6-diyn-4-en-3-ols with furans has been developed. Gold catalysts are effective to catalyze three cascade processes involving Friedel–Crafts/furan-ynecyclization/heteroenynemetathesis through CO bond and alkyne activation. This method offers several advantages such as high selectivities and easily accessible