Ancillary ligand-free copper catalysed hydrohydrazination of terminal alkynes with NH<sub>2</sub>NH<sub>2</sub>
作者:Jesse L. Peltier、Rodolphe Jazzar、Mohand Melaimi、Guy Bertrand
DOI:10.1039/c5cc10427k
日期:——
An efficient and selective Cu-catalysed hydrohydrazination of terminalalkynes with parent hydrazine is reported. The methodology tolerates a broad range of functional groups, allows for the synthesis of symmetrical and...
Disulfonimide‐Catalyzed Asymmetric Reduction of
<i>N</i>
‐Alkyl Imines
作者:Vijay N. Wakchaure、Philip S. J. Kaib、Markus Leutzsch、Benjamin List
DOI:10.1002/anie.201504052
日期:2015.9.28
A chiral disulfonimide (DSI)‐catalyzedasymmetric reduction of N‐alkyl imines with Hantzsch esters as a hydrogen source in the presence of Boc2O has been developed. The reaction delivers Boc‐protectedN‐alkyl amines with excellent yields and enantioselectivity. The method tolerates a large variety of alkyl amines, thus illustrating potential for a general reductive cross‐coupling of ketones with diverse
Asymmetric hydrogenation of N-alkyl and N-aryl ketimines using chiral cationic Ru(diamine) complexes as catalysts: the counteranion and solvent effects, and substrate scope
作者:Fei Chen、Ziyuan Ding、Yanmei He、Jie Qin、Tianli Wang、Qing-Hua Fan
DOI:10.1016/j.tet.2012.03.019
日期:2012.7
Asymmetrichydrogenation of N-alkyl and N-aryl ketimines catalyzed by chiralcationic η6-arene-(N-monosulfonylated diamine) Ru(II) complexes has been investigated. Strong counteranion and solvent effects on the enantioselectivity were observed. The ruthenium catalyst bearing non-coordinating BArF− anion was found to be particularly effective for the hydrogenation of acyclic and exocyclic N-alkyl ketimines
A novel cationic [IrH(THF)(P,N)(imine)] [BArF] catalyst containing a P-stereogenic MaxPHOX ligand is described for the direct asymmetrichydrogenation of N-methyl and N-alkyl imines. This is the first catalytic system to attain high enantioselectivity (up to 94% ee) in this type of transformation. The labile tetrahydrofuran ligand allows for effective activation and reactivity, even at low temperatures
The synthesis of 2-trialkylsilylaziridines from vinyltrialkylsilanes or the reaction of α-chloro-α-silyl carbanions with imines
作者:Alan R. Bassindale、Patricia A. Kyle、Marie-Claire Soobramanien、Peter G. Taylor
DOI:10.1039/a905182a
日期:——
Three methods have been employed in the synthesis of 2-trialkylsilylaziridines. Firstly, reacting α-chloro-α-silyl carbanions with imines. Secondly, from the corresponding vinylsilane, via addition of bromoazide to give the 1-bromo-2-azide, followed by reduction. Finally, by the addition of organoazides to vinylsilanes using thermochemical and photochemical conditions. Using these three strategies a range of substitution patterns have been achieved.