An unprecedented aryne-mediated dearomatization reaction is described. An aryne intermediate generated from arenesulfonyl ynamide-tethered triynes and tetraynes reacts with both the pi-systems of a tethered alkene and the arenesulfonyl group to generate cyclohexa-1,3-diene-containing pentacyclic and hexacyclic frameworks. Density functional theory (DFT) calculations show a nucleophilic dearomatization mechanism involving a zwitterionic intermediate derived from an aryne. A novel halogen effect on the efficiency of the dearomatization and deterrence of aromatization of the cyclohexa-1,3-diene moiety was also observed.
A Radical-Initiated Fragmentary Rearrangement Cascade of Ene-Ynamides to [1,2]-Annulated Indoles via Site-Selective Cyclization
作者:Sifan Li、Yu Wang、Zibo Wu、Weiliang Shi、Yibo Lei、Paul W. Davies、Wei Shu
DOI:10.1021/acs.orglett.1c02519
日期:2021.9.17
Herein, a radical triggered fragmentary cyclization cascade reaction of ene-ynamides is presented, providing a rapid access into [1,2]-annulated indoles by an intermolecular radical addition, intramolecular cyclization, desulfonylative aryl migration, and site-selective C(sp2)-N cyclization sequence. DFT calculations support oxidation of N-centered radical species to cations prior to the C–N bond formation
Design and Application of
<scp>Indole‐Based</scp>
Allylic Donors for
<scp>Pd‐Catalyzed</scp>
Decarboxylative Allylation Reactions
<sup>†</sup>
作者:Qing‐Qing Hang、Si‐Jia Liu、Lei Yu、Ting‐Ting Sun、Yu‐Chen Zhang、Guang‐Jian Mei、Feng Shi
DOI:10.1002/cjoc.202000104
日期:2020.12
class of indole‐based allylic donors have been designed and developed for palladium‐catalyzed decarboxylative allylations. In addition, the first application of these indole‐based allylic donors in palladium‐catalyzed decarboxylative [3+2] cycloaddition and allylic amination has been achieved by reacting with isocyanates and sulfonyl amines, respectively. This approach represents the first design of indole‐based
A stepwise preparation of a series of nitrogen-containing 25-membered pentaolefinic macrocycles is presented. The corresponding arenesulfonamides and trans-1,4-dibromo-2-butene served as precursors for the synthesis.
Copper-catalyzed N-arylation of tert-butyl N-sulfonylcarbamates with diaryliodonium salts at room temperature
作者:Soo-Yeon Moon、Moonjee Koh、Kris Rathwell、Seo-Hee Jung、Won-Suk Kim
DOI:10.1016/j.tet.2015.01.032
日期:2015.3
A new and mild synthetic approach for the synthesis of N-arylsulfonamides under copper-catalyzed conditions at room temperature has been developed. The reaction employs various tert-butyl N-sulfonylcarbamates and diaryliodoniumsalts to avoid potential genotoxic impurities. A one-pot coupling/Boc-deprotection sequence is also reported to provide mono N-arylsulfonamides in good to excellent yields.
15-Membered triolefinic macrocycles as stabilizers of palladium(0) nanoparticles
作者:Anna Serra-Muns、Roger Soler、Elena Badetti、Paula de Mendoza、Marcial Moreno-Mañas、Roser Pleixats、Rosa M. Sebastián、Adelina Vallribera
DOI:10.1039/b608673j
日期:——
15-Membered triolefinic macrocycles form complexes with palladium(0). However, metal nanoparticles are formed instead of discrete complexes if substituents provided with the ability to stabilize nanoparticles are incorporated into the structure of the macrocycle. Ancillary substituents include fluorous and polyoxyethylenated chains. The role of initial organometallic coordination in the early steps of nanoparticle formation is underlined.