在外部或内部亲核试剂存在下,金 (I) 催化的o -烯基- o' -炔基联芳基环化提供了一种直接获得基于菲的多环化合物的途径,这在材料科学中具有相当大的意义。因此,它们与醇的反应产生功能化的二氢菲,该过程也可以在分子内进行,以提供菲衍生的杂多环化合物。此外,苯并[ b ]苯并[b]联苯可以由o-甲氧基乙烯基-o'-炔基联芳基合成,在其中三键上的(杂)芳基取代基充当内部亲核试剂的反应中。
Iron-catalyzed tandem carbon–carbon/carbon–oxygen bond formation/aromatization of 2′-alkynyl-biphenyl-2-carbinols: a new approach to the synthesis of substituted phenanthrenes
作者:Krishnendu Bera、Soumen Sarkar、Umasish Jana
DOI:10.1016/j.tetlet.2014.11.073
日期:2015.1
An iron-catalyzed efficientsynthesis of substituted phenanthrenes through tandem intramolecular C–C/C–O bond formations/aromatization of 2′-alkynyl-biphenyl-2-carbinols is reported. This method provides a novel, highlyefficient, and straightforward route to 9,10-substituted phenanthrene in good to excellent yields. The present strategy involves tandem Fe(OTf)3-catalyzed generation of benzylic carbocation
Metal‐Free Aminoiodination of Alkynes Under Visible Light Irradiation for the Construction of a Nitrogen‐Containing Eight‐Membered Ring System
作者:Kyalo Stephen Kanyiva、Tane Marina、Shun Nishibe、Takanori Shibata
DOI:10.1002/adsc.202100019
日期:2021.6.8
method for the synthesis of dihydrodibenzo[c,e]azocine derivatives via a regioselective intramolecular aminoiodination of alkynes under visible light irradiation has been developed. This protocol uses a combination of iodine and hypervalent iodine to realize a sulfonamidyl radical, followed by intramolecular addition to alkyne to form a vinyl radical. Subsequent trapping of iodine radical affords an 8-membered
已经开发了一种在可见光照射下通过炔烃的区域选择性分子内氨基碘化合成二氢二苯并 [ c , e ]azocine 衍生物的方法。该协议使用碘和高价碘的组合来实现磺酰胺基自由基,然后分子内加成到炔以形成乙烯基自由基。随后碘自由基的捕获提供了一个 8 元杂环。还展示了获得的碘化 8 元杂环在 Suzuki-Miyaura 偶联和脱碘中的应用。
Selective Synthesis of Phenanthrenes and Dihydrophenanthrenes via Gold-Catalyzed Cycloisomerization of Biphenyl Embedded Trienynes
作者:Ana Milián、Patricia García-García、Adrián Pérez-Redondo、Roberto Sanz、Juan J. Vaquero、Manuel A. Fernández-Rodríguez
DOI:10.1021/acs.orglett.0c03067
日期:2020.11.6
Readily available o′-alkenyl-o-alkynylbiaryls, a particular type of 1,7-enynes, undergo a selective cycloisomerization reaction in the presence of a gold(I) catalyst to give interesting phenanthrene and dihydrophenanthrene derivatives in high yields. The solvent used provokes a switch in the evolution of the gold intermediate and plays a key role in the reaction outcome.
作者:Vladimir Akhmetov、Mikhail Feofanov、Dmitry I. Sharapa、Konstantin Amsharov
DOI:10.1021/jacs.1c07845
日期:2021.9.22
alkynes is the key feature of carbophilic π-Lewis acids such as gold- and platinum-based catalysts. The unique catalytic activity of these compounds in electrophilic activations of alkynes is explained through relativistic effects, enabling efficient orbital overlapping with π-systems. For this reason, it is believed that noble metals are indispensable components in the catalysis of such reactions. In this
Iron-catalyzed alkyne–carbonyl metathesis for the synthesis of 6,7-dihydro-5<i>H</i>-dibenzo[<i>c</i>,<i>e</i>]azonines
作者:Baitan Chakraborty、Umasish Jana
DOI:10.1039/d1ob01258d
日期:——
The synthesis of nine-membered rings via alkyne–carbonyl metathesis is reported. The alkyne and acetal units contained in a biaryl substrate undergo the intramolecular alkyne–carbonyl metathesisreaction under FeCl3-catalysis to furnish the unexplored 6,7-dihydro-5H-dibenzo[c,e]azonines. The method provides an alternative to existing routes to nine-membered rings with cheap, non-toxic iron catalysts
报道了通过炔烃-羰基复分解合成九元环。联芳基底物中所含的炔烃和缩醛单元在 FeCl 3催化下发生分子内炔烃-羰基复分解反应,得到未开发的 6,7-dihydro-5 H -dibenzo [ c , e ]azanines。该方法通过廉价、无毒的铁催化剂和更温和的条件为现有的九元环路线提供了一种替代方案。