Catalytic C(sp
<sup>3</sup>
)−H Arylation of Free Primary Amines with an
<i>exo</i>
Directing Group Generated In Situ
作者:Yan Xu、Michael C. Young、Chengpeng Wang、David M. Magness、Guangbin Dong
DOI:10.1002/anie.201604268
日期:2016.7.25
Herein, we report the palladium‐catalyzeddirectarylation of unactivated aliphatic C−H bonds in free primary amines. This method takes advantage of an exo‐imine‐type directing group (DG) that can be generated and removed in situ. A range of unprotected aliphatic amines are suitable substrates, undergoing site‐selective arylation at the γ‐position. Methyl as well as cyclic and acyclic methylene groups
Ketone Synthesis by Direct, Orthogonal Chemoselective Hydroacylation of Alkenes with Amides: Use of Alkenes as Surrogates of Alkyl Carbanions
作者:Hui Geng、Pei‐Qiang Huang
DOI:10.1002/cjoc.201900252
日期:2019.8
and direct transformation of carboxamides are two exciting areas that have attracted considerable attention in recent years. We report herein that secondaryamides, the least reactive derivatives of carbonyl compounds, upon activated with triflic anhydride, can serve as effective hydroacylating reagents in partner with alkenes to yield ketones at ambient temperature. The method was applied to the one‐step
A Comparison of Immobilised Triphenylphosphine and 1‐Hydroxybenzotriazole as Mediators of Catch‐and‐Release Acylation Under Flow Conditions
作者:Joseph Tadros、Christian Dankers、Ashley Jurisinec、Maria Menti‐Platten、Janice R. Aldrich‐Wright、Christopher P. Gordon
DOI:10.1002/asia.202101308
日期:2022.3
A ‘catch-and-release’ assessment of immobilised triphenylphosphine (PS-PPh3) and 1-hydroxybenzotriazole (PS-HOBt) as facilitators of acylation-mediated amide couplings is described. Through evaluations of reaction temperatures, substrate stoichiometries, solvents, and flow rates, we report findings in favour of PS-HOBt over PS-PPh3.
of alkynes remains rather limited due to the high feasibility of the key metal-alkenyl intermediate to choose other reaction pathways. Herein, we report a NiH-catalyzed strategy for the hydroamidation of alkynes with dioxazolones, which allows convenient access to synthetically useful secondaryenamides in (E)-anti-Markovnikov or Markovnikov selectivity. The reaction is viable for both terminal and
A general copper/air catalytic system for selectively oxidative C–Cbondcleavage of 1,2-diarylethan-1-one has been developed, giving aromatic aldehydes and N-benzoylation products of various amines in moderate to excellent yields. This research provides an alternative approach for the N-benzoylation of amine in mild and neutral conditions.