Implication of a Silyl Cobalt Dihydride Complex as a Useful Catalyst for the Hydrosilylation of Imines
作者:Cassandre C. Bories、Marion Barbazanges、Etienne Derat、Marc Petit
DOI:10.1021/acscatal.1c03886
日期:2021.11.19
Here, we describe the formation and use of silyl cobalt (III) dihydride complexes as powerful catalysts for the hydrosilylation of a variety of imines starting from a low-valent well-defined cobalt (I) complex. The reaction is efficient at low catalyst loadings with a diverse range of imines bearing various protecting groups, as well as aliphatic ketimines and quinoline. Kinetics, DFT calculations
Copper-catalyzed condensation of imines and α-diazo-β-dicarbonyl compounds: modular and regiocontrolled synthesis of multisubstituted pyrroles
作者:Wei Wen Tan、Naohiko Yoshikai
DOI:10.1039/c5sc02322j
日期:——
In the presence of a copper(II) catalyst, enolizable imines bearing various N-substituents and α-diazo-β-ketoesters undergo denitrogenative and dehydrative condensation to afford highly substituted pyrroles in moderate to good yields with exclusive regioselectivity. The reaction likely involves nucleophilic addition of the imine nitrogen to a copper carbenoid, tautomerization of the resulting azomethine
Synthesis of enantiomerically pure acyclic α-sulfinyl ketimines
作者:José L Garcı́a Ruano、Antonio Lorente、Jesús H Rodrı́guez Ramos
DOI:10.1016/s0957-4166(98)00211-0
日期:1998.7
Two different methods to obtain enantiomerically pure N-alkyl and N-aryl alpha-sulfinyl ketimines are reported. Reaction of enantiomerically pure alpha-sulfinyl ketones (1-6) with benzylamine or p-methoxyaniline, in the presence of molecular sieves (3 Angstrom), yields the corresponding of N-benzyl and N-p-methoxyphenyl ketimines (7A-12A and 7B-12B). Better results were achieved by alpha-sulfinylation of ketimines (13A-18A and 13B-18B) with (-)-menthyl p-toluenesulfinate in the presence of lithium (N-arylimines) or magnesium (N-benzylimines) bases. The different tautomeric behaviour of the obtained N-aryl and N-alkyl derivatives is reported. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
Palladium-Catalyzed Aerobic Oxidative Cyclization of <i>N</i>-Aryl Imines: Indole Synthesis from Anilines and Ketones
作者:Ye Wei、Indubhusan Deb、Naohiko Yoshikai
DOI:10.1021/ja3030824
日期:2012.6.6
We report here an operationally simple, palladium-catalyzed cyclization reaction of N-aryl imines, affording indoles via the oxidative linkage of two C-H bonds under mild conditions using molecular oxygen as the sole oxidant. The process allows quick and atom-economical assembly of indole rings from inexpensive and readily available anilines and ketones and tolerates a broad range of functional groups