Cu-Catalyzed Cascades to Carbocycles: Union of Diaryliodonium Salts with Alkenes or Alkynes Exploiting Remote Carbocations
作者:Fengzhi Zhang、Shoubhik Das、Andrew J. Walkinshaw、Alicia Casitas、Michael Taylor、Marcos G. Suero、Matthew J. Gaunt
DOI:10.1021/ja504361y
日期:2014.6.25
Copper-catalyzed cascade reactions between alkenes or alkynes and diaryliodonium salts form carbocyclic products in a single step. Arylation of the unsaturated functional group is proposed to form a carbocation intermediate that facilitates hydride shift pathways to translocate the positive charge to a remote position and enables ring formation via a Friedel-Crafts-type reaction.
Selective and efficient: The copper(II)‐catalyzed selective monoarylation of vicinaldiols with diaryliodonium triflates was successfully developed. In this catalytic process high chemoselectivity was achieved, even in the presence of a 1:1 mixture of the 1,2‐diol and the mono‐ol, and a wide range of substrates was tolerated, giving the monoarylated products in good to excellent yields (see scheme)
Direct Arylation of Primary and Secondary sp<sup>3</sup> C–H Bonds with Diarylhyperiodonium Salts via Pd Catalysis
作者:Fei Pan、Peng-Xiang Shen、Li-Sheng Zhang、Xin Wang、Zhang-Jie Shi
DOI:10.1021/ol402116a
日期:2013.9.20
Palladium-catalyzed primary and secondary sp3 C–H bond arylation is reported. The method using diarylhyperiodonium salts as arylation reagents shows good functional group tolerance and proceeds under mild reaction conditions. The KIE experiments show that the C–H bond activation is the rate-determining step.
Visible-light-mediated arylation of <i>ortho</i>-hydroxyarylenaminones: direct access to isoflavones
作者:Satenik Mkrtchyan、Viktor O. Iaroshenko
DOI:10.1039/c9cc09945j
日期:——
The first visible-light-promoted direct synthesis of isoflavones following the arylation of ortho-hydroxyarylenaminones by aryl onium salts was developed.
Transition-metal-free α-arylation of α-nitroketones with diaryliodonium salts has been realized for the first time. As an application of this methodology, a concise synthesis of the clinical drug tiletamine was also achieved via a three-step procedure from 2-nitrocyclohexanone without the isolation of intermediates.