Fe-Catalyzed Allylic C–C-Bond Activation: Vinylcyclopropanes As Versatile a1,a3,d5-Synthons in Traceless Allylic Substitutions and [3 + 2]-Cycloadditions
作者:André P. Dieskau、Michael S. Holzwarth、Bernd Plietker
DOI:10.1021/ja300294a
日期:2012.3.21
The low-valent iron complex Bu(4)N[Fe(CO)(3)(NO)] (TBAFe) catalyzes the allylic C-C-bond activation of electron-poor vinyl cyclopropanes to generate syntheticallyuseful a1,a3,d5-synthons which are prone to undergo multiple consecutive reactions. The versatility of this approach is demonstrated by a traceless allylic substitution and a formal [3 + 2] cycloaddition to give either functionalized acyclic
Thiol-Mediated α-Amino Radical Formation via Visible-Light-Activated Ion-Pair Charge-Transfer Complexes
作者:Keishi Kohara、Aaron Trowbridge、Milo A. Smith、Matthew J. Gaunt
DOI:10.1021/jacs.1c09445
日期:2021.11.24
activation mode is demonstrated through the development of a multicomponent coupling reaction to form substituted aminomethyl-cyclopentanes from secondaryamines, cyclopropyl aldehydes, and alkenes. The operationally straightforward transformation displays broad scope and provides a means to generate cyclic amine-containing scaffolds from readily available feedstocks.
Solvent-free and room temperature microwave-assisted direct C7 allylation of indolines <i>via</i> sequential C–H and C–C activation
作者:Qiuling Wang、Linlin Shi、Shuang Liu、Changlei Zhi、Lian-Rong Fu、Xinju Zhu、Xin-Qi Hao、Mao-Ping Song
DOI:10.1039/d0ra02016h
日期:——
A Ru or Rh-catalyzed efficient and atom-economic C7allylation of indolines with vinylcyclopropanes was developed viasequentialC–H and C–Cactivation. A wide range of substrates were well tolerated to afford the corresponding allylated indolines in high yields and E/Z selectivities under microwave irradiation. The obtained allylated indolines could further undergo transformations to afford various
Novel 2-vinyl- and 2-ethyl-cyclopropyl sulfones are provided. In addition to the ethyl or vinyl group at the 2-position of the ring, the compounds of this invention are disubstituted at the 1-position with a sulfonyl group and an acyl, nitrile or nitrile-derived radical. The sulfones of this invention are useful chemical intermediates from which a wide variety of pesticidal, herbicidal or biologically active compounds can be prepared and are useful monomers for anionic or radical polymerizations.
(3+2) cycloadditions of donor-acceptor (D-A) cyclopropenes bearing two different electron-withdrawing groups were reported. Various chiral five-membered oxa- and aza-heterocycles were produced, and good yields and high stereoselectivities were obtained. The key to the success of this reaction is the remote stereoinduction through H-bonding from chiral ligands.