3-芳基苯并[ d ]异恶唑的钯催化氧化均偶联和羟基化反应是通过使用苯并异恶唑作为新的导向基团通过直接的C(sp 2)-H键活化而开发的。该协议以高收率提供了功能化的,合成上有用的苯并异恶唑的不同方法。至关重要的是,1-碘-4-甲氧基苯起氧化剂的作用,介导脱氢的均偶联作用并最小化交叉偶联。X射线晶体学证实了双核二聚体Palladacycle中间体,并在催化循环中用作活性催化物质。
Rhodium-catalyzed Synthesis of 1-Arylisoquinoline Derivatives through Annulative Coupling of 3-Aryl-1,2-benzisoxazoles and Alkynes
作者:Teppei Noguchi、Yuji Nishii、Masahiro Miura
DOI:10.1246/cl.170618
日期:2017.10.5
annulative coupling of 3-aryl-1,2-benzisoxazoles and alkynes efficiently proceeds in the presence of a Cp*Rh(III) catalyst to produce 2-(1-isoquinolinyl)phenols of interest in medicinal chemistry as well as materials chemistry. The products may also be useful precursors of quinoline-based bidentateligands.
An improved synthesis of 1,2-benzisoxazoles: TBAF mediated 1,3-dipolar cycloaddition of nitrile oxides and benzyne
作者:Christian Spiteri、Pallavi Sharma、Fengzhi Zhang、Simon J. F. Macdonald、Steve Keeling、John E. Moses
DOI:10.1039/b922489k
日期:——
An efficient synthesis of a range of 1,2-benzisoxazoles using an improved1,3-dipolarcycloaddition of nitrileoxides and benzyne is described. Key to the procedure is the in situgeneration of the reactive nitrileoxide and benzyne reaction partners mediated by TBAF. Reactions are complete within 30 s, giving the target products in good to excellent yield.
An efficient entry to 1,2-benzisoxazoles via 1,3-dipolar cycloaddition of in situ generated nitrile oxides and benzyne
作者:Christian Spiteri、Christopher Mason、Fengzhi Zhang、Dougal J. Ritson、Pallavi Sharma、Steve Keeling、John E. Moses
DOI:10.1039/b927235f
日期:——
An efficient protocol for the synthesis of a range of 1,2-benzisoxazoles using an improved1,3-dipolarcycloaddition of nitrileoxides and benzyne is described. Key to the procedure is the in situgeneration of the reactive nitrileoxide and benzyne reactants simultaneously.
Selective [5 + 1] and [5 + 2] Cycloaddition of Ynamides or Propargyl Esters with Benzo[<i>d</i>]isoxazoles via Gold Catalysis
作者:Wei Xu、Jidong Zhao、Xiangdong Li、Yuanhong Liu
DOI:10.1021/acs.joc.8b02935
日期:2018.12.21
Benzo[d]isoxazoles are found to act as novel nucleophiles to undergo gold-catalyzed [5 + 1] or [5 + 2] cycloaddition reactions with ynamides. The reaction provides a concise and chemoselective access to polysubstituted 2H-benzo[e][1,3]oxazines or benzo[f][1,4]oxazepines. In addition, benzo[d]isoxazoles can also react with gold-carbene intermediates derived from propargyl esters to afford [5 + 1] annulation
发现苯并[ d ]异恶唑可作为新型亲核试剂与金酰胺进行金催化的[5 + 1]或[5 + 2]环加成反应。该反应提供了对多取代的2 H-苯并[ e ] [1,3]恶嗪或苯并[ f ] [1,4]氧杂ze子的简明和化学选择性的途径。另外,苯并[ d ]异恶唑也可以与衍生自炔丙基酯的金卡宾中间体反应,得到[5 +1]环化产物。
Cycloaddition of benzynes and nitrile oxides: synthesis of benzisoxazoles
作者:James A. Crossley、Duncan L. Browne
DOI:10.1016/j.tetlet.2010.02.103
日期:2010.4
A mild and efficient process has been developed for the synthesis of benzisoxazoles through the cycloaddition of benzynes and nitrileoxides. This method allows access to both (hetero)aromatic and alkenyl-substituted benzisoxazoles. Preliminary studies concerning regioselectivity are also reported.