Synthesis of spiroisoindolinones by palladium-catalyzed heterocyclization of 2-iodobenzoyl chloride with ketimines
作者:Chan Sik Cho、Xue Wu、Li Hong Jiang、Sang Chul Shim、Hong Rak Kim
DOI:10.1002/jhet.5570360147
日期:1999.1
2-Iodobenzoyl chloride reacts with ketimines in acetonitrile at 100° undercarbonmonoxidepressure in the presence of a catalytic amount of a palladium catalyst together with triethylamine to afford the corresponding spiroisoindolinones in high yields.
Zinc(II)-Catalyzed Synthesis of Propargylamines by Coupling Aldimines and Ketimines with Alkynes
作者:Syeda Aaliya Shehzadi、Aamer Saeed、Filip Lemière、Bert U. W. Maes、Kourosch Abbaspour Tehrani
DOI:10.1002/ejoc.201701567
日期:2018.1.10
Imines derived from unactivated aldehydes or ketones and primary amines or α‐amino acid esters have been shown to undergo a ZnII‐catalyzed reaction with a variety of terminal alkynes to give secondary propargylamines that have tri‐ and tetrasubstituted α‐carbon atoms (from aldimines and ketimines, respectively).
The 1H, 13C, and 15N NMRspectra of 5 exocyclic alkenes and 15 different ketimines obtained from cyclohexanone and derivatives using benzyl bromide and primary amines—are analyzed. Relative stereochemical and preferential conformations are determined by analyzing both the homonuclear coupling and the chemical shifts of the protons and carbon atoms in the aliphatic rings, which are directly related
Structural and conformational analysis of 1-oxaspiro[2.5]octane and 1-oxa-2-azaspiro[2.5]octane derivatives by 1H, 13C, and 15N NMR
作者:Rubén Montalvo-González、Armando Ariza-Castolo
DOI:10.1002/mrc.3792
日期:2012.1
A structural and conformational analysis of 1-oxaspiro[2.5]octane and 1-oxa-2-azaspiro[2.5]octane derivatives was performed using (1) H, (13) C, and (15) N NMR spectroscopy. The relative configuration and preferred conformations were determined by analyzing the homonuclear coupling constants and chemical shifts of the protons and carbon atoms in the aliphatic rings. These parameters directly reflected
Convenient one-pot syntheses of pyrazoles from imines, a vilsmeier type reagent and hydrazine
作者:Alan R. Katritzky、Anna Denisenko、Sergey N. Denisenko、Michael Arend
DOI:10.1002/jhet.5570370548
日期:2000.9
one-pot procedure for the regioselective synthesis of pyrazoles from readily available starting materials is described. Vilsmeier type reagent 1 reacts with imines 10 (via the corresponding tautomeric secondary enamines) in tetrahydrofuran to give enaminoimine hydrochlorides 11. Nonsymmetrical imines generally react preferentially with 1 at the sterically less hindered α-position. The enaminoimine hydrochlorides