Synthesis of α-Fluoroketones from Vinyl Azides and Mechanism Interrogation
作者:Shu-Wei Wu、Feng Liu
DOI:10.1021/acs.orglett.6b01691
日期:2016.8.5
An efficient and mild fluorination of vinylazides for the synthesis of α-fluoroketones is described. The mechanistic studies indicated that a single-electron transfer (SET) and a subsequent fluorine atom transfer process could be involved in the reaction.
A novel and versatile method for the synthesis of 2H-imidazoles via iron-catalyzed [3 + 2] annulation from readily available oxime acetates with vinyl azides has been developed. This denitrogenative process involved N–O/N–N bond cleavages and two C–N bond formations to furnish 2,4-substituted 2H-imidazoles. This protocol was performed under mild reaction conditions and needed no additives or ligands
Synthesis of Isoquinoline Derivatives via Palladium‐Catalyzed C−H/C−N Bond Activation of
<i>N</i>
‐Acyl Hydrazones with
<i>α</i>
‐Substituted Vinyl Azides
A palladium‐catalyzed cyclization of N‐acetyl hydrazones with vinyl azides has been developed. Various substituted isoquinolines, including diverse fused isoquinolines can be prepared via this protocol in moderate to good yields. Mechanistic studies suggest that α‐substituted vinyl azide serves as an internal nitrogen source. Also, C−H bond activation and C−N bond cleavage have been realized using
Electrochemical Synthesis of
<i>O</i>
‐Phthalimide Oximes from
<i>α</i>
‐Azido Styrenes
<i>via</i>
Radical Sequence: Generation, Addition and Recombination of Imide‐
<i>N</i>
‐Oxyl and Iminyl Radicals with C−O/N−O Bonds Formation
作者:Stanislav A. Paveliev、Artem I. Churakov、Liliya S. Alimkhanova、Oleg O. Segida、Gennady I. Nikishin、Alexander O. Terent'ev
DOI:10.1002/adsc.202000618
日期:2020.9.21
Electrochemically induced radical‐initiated reaction of vinyl azides with N‐hydroxyphthalimide resulting O‐phthalimide oximes with challenging for organic chemistry N−O‐N fragment has been discovered. The developed approach introduces in synthesis electrochemically generated O‐centered imide‐N‐oxyl radicals as the coupling components. Sequential formation of C−O and N−O bonds was achieved via generation
The Iridium-catalyzed enantioselective couplingreaction of vinyl azides and allylic electrophiles is presented and provides access to β-chiral carbonyl derivatives. Vinyl azide are used as acetamide enolate or acetonitrile carbanion surrogates, leading to γ,δ-unsaturated β-substituted amides as well as nitriles with excellent enantiomeric excess. The products are readily transformed into chiral N-containing