Rhodium‐Catalyzed Atroposelective Construction of Indoles via C−H Bond Activation
作者:Lincong Sun、Haohua Chen、Bingxian Liu、Junbiao Chang、Lingheng Kong、Fen Wang、Yu Lan、Xingwei Li
DOI:10.1002/anie.202012932
日期:2021.4.6
rhodium(III)‐catalyzed C−H activation of anilines bearing an N‐isoquinolyl directing group for oxidative [3+2] annulation with four classes of internal alkynes, leading to atroposelective indolesynthesis via dynamic kinetic annulation with C‐N reductive elimination constituting the stereo‐determining step. This reaction proceeds under mild conditions with high regio‐ and enantioselectivity and functional
C−Boron Enolates Enable Palladium Catalyzed Carboboration of Internal 1,3‐Enynes
作者:Ziyong Wang、Jason Wu、Walid Lamine、Bo Li、Jean‐Marc Sotiropoulos、Anna Chrostowska、Karinne Miqueu、Shih‐Yuan Liu
DOI:10.1002/anie.202108534
日期:2021.9.20
generated by a kinetically controlled halogenexchange between chlorocatecholborane and silylketene acetals, is described. These C−boron enolates are demonstrated to activate 1,3-enyne substrates in the presence of a Pd0/Senphos ligand complex, resulting in the first examples of a carboboration reaction of an alkyne with enolate-equivalent nucleophiles. Highly substituted dienyl boron building blocks are
A highly enantioselective and atom-economical [2 + 2] cycloaddition of various alkynes with trifluoropyruvate using a dicationic (S)-BINAP-Pd catalyst has been established. This is the first enantioselective synthesis of stable oxetene derivatives, whose structure has been clarified by X-ray analysis. This catalytic process offers a practical synthetic method for oxetene derivatives (catalyst loading:
Synthesis of oxaboranes <i>via</i> nickel-catalyzed dearylative cyclocondensation
作者:Mason T. Koeritz、Haley K. Banovetz、Sean A. Prell、Levi M. Stanley
DOI:10.1039/d2sc01840c
日期:——
reaction is initiated by oxidative cyclization of the aldehyde and alkyne couplingpartners to generate an oxanickelacyclopentene which reacts with triphenylborane to form oxaboranes. This formal dearylative cyclocondensation reaction generates oxaboranes in moderate-to-high yields (47–99%) with high regioselectivities under mild reaction conditions. This approach represents a direct and modular synthesis
我们报告了 Ni 催化的醛、炔烃和三苯基硼烷的脱芳基环缩合反应。该反应由醛和炔偶合配对物的氧化环化引发,生成氧杂环戊烯,该氧杂环戊烯与三苯基硼烷反应形成氧杂硼烷。这种形式化的脱芳基环缩合反应在温和的反应条件下以中等至高产率 (47-99%) 生成氧硼烷,并具有高区域选择性。这种方法代表了使用当前方法难以获得的氧硼烷的直接和模块化合成。这些氧硼烷很容易转化为有价值的有机合成构件和另一类硼杂环。选择性同源偶联形成氧杂硼杂环戊二烯,氧化产生醛醇产物,还原和芳基化形成取代的烯丙醇。
<i>trans</i>-Hydroalkynylation of Internal 1,3-Enynes Enabled by Cooperative Catalysis
作者:Ziyong Wang、Chen Zhang、Jason Wu、Bo Li、Anna Chrostowska、Panaghiotis Karamanis、Shih-Yuan Liu