Ligand‐Enabled Catalytic CH Arylation of Aliphatic Amines by a Four‐Membered‐Ring Cyclopalladation Pathway
作者:Chuan He、Matthew J. Gaunt
DOI:10.1002/anie.201508912
日期:2015.12.21
palladium‐catalyzed CHarylation of aliphaticamines with arylboronic esters is described, proceeding through a four‐membered‐ringcyclopalladationpathway. Crucial to the successful outcome of this reaction is the action of an amino‐acid‐derived ligand. A range of hindered secondary amines and arylboronic esters are compatible with this process and the products of the arylation can be advanced to
tested. The trialkylamines underwent a dealkylation reaction, depending on the degree of steric stress, even at ambient temperature. Because olefins were formed in this transformation, it showed some similarity with the Hofmann elimination. However, the thermal decay of sterically overcrowded tertiary amines was not promoted by bases. Instead, this reaction was strongly accelerated by protic conditions and
Efficient selective oxidation of alcohols to aldehydes catalyzed by a morpholinone nitroxide
作者:Zhenhua Dong、Pengwei Gao、Yongmei Xiao
DOI:10.1080/00397911.2019.1666284
日期:2019.12.2
Abstract Efficient chemoselective oxidation of primaryalcohols to the corresponding aldehydes is described. The transformation is promoted by a catalytic morpholinone nitroxide radical catalyst which can be easily synthesized. A broad range of substrates including aromatic and aliphatic primaryalcohols are converted with excellent yields under mild conditions. The control experiments reveal that
Palladium-Catalyzed Enantioselective C–H Activation of Aliphatic Amines Using Chiral Anionic BINOL-Phosphoric Acid Ligands
作者:Adam P. Smalley、James D. Cuthbertson、Matthew J. Gaunt
DOI:10.1021/jacs.6b12234
日期:2017.2.1
design of an enantioselective Pd(II)-catalyzed C-H amination reaction is described. The use of a chiral BINOL phosphoric acid ligand enables the conversion of readily available amines into synthetically valuable aziridines in high enantiomeric ratios. The aziridines can be derivatized to afford a range of chiral amine building blocks incorporating motifs readily encountered in pharmaceutically relevant
Continuous-Flow Synthesis and Derivatization of Aziridines through Palladium-Catalyzed C(sp<sup>3</sup>)−H Activation
作者:Jacek Zakrzewski、Adam P. Smalley、Mikhail A. Kabeshov、Matthew J. Gaunt、Alexei A. Lapkin
DOI:10.1002/anie.201602483
日期:2016.7.25
A continuous-flow synthesis of aziridines by palladium-catalyzed C(sp(3) )-H activation is described. The new flow reaction could be combined with an aziridine-ring-opening reaction to give highly functionalized aliphatic amines through a consecutive process. A predictive mechanistic model was developed and used to design the C-H activation flow process and illustrates an approach towards first-principles