Lithium-<i>N</i>-lithiomethyldithiocarbamate: Neue<i>N</i>-Alkylaminomethylanion-Äquivalente; III<sup>1</sup>. 2-Imidazolidinthione and 1,2-Diamine durch eletrophile Aminoalkylierung mit Iminen und Immoniumsalzen
作者:Hubertus Ahlbrecht、Christine Schmitt
DOI:10.1055/s-1994-25556
日期:——
Lithium N-Lithiomethyldithiocarbamates: New N-Alkylaminomethyl Anion Equivalents; III.1 2-Imidazolidinethiones and 1, 2-Diamines via Electrophilic Aminoalkylation with Imines and Iminium Salts Treatment of lithium N-butyl-N-lithiomethyldithiocarbamates 3 with various aldimines and ketimines 4 leads to 1,3,4, 4-tetrasubstituted 2-imidazolidinethiones 6. If iminium salts 7 are used as electrophiles, unsymmetrically substituted 1,2-diamines 8 are obtained.
作者:Jan Alexander Barten、Enno Lork、Gerd-Volker Röschenthaler
DOI:10.1016/j.jfluchem.2003.09.008
日期:2004.6
Selected imines reacted with hexafluoroacetone non-catalyzed at ambient temperature to give β-hydroxy-β-bis(trifluoromethyl) imines in good to excellent yields. For the imines of acetone, pentan-3-one, and of cyclohexanone a 1:2 reaction was observed giving iminodiols; for N,N′-bis(propylidene)ethylene diamine an iminotetrol was formed. The diol derivative of N-isopropyl-propylidene amine could be
An Efficient, Scaleable Procedure for the Conversion of Esters to Isoxazoles
作者:W. H. Bunnelle、P. R. Singam、B. A. Narayanan、C. W. Bradshaw、J. S. Liou
DOI:10.1055/s-1997-1211
日期:1997.4
A concise, regiocontrolled route to isoxazoles, based on the condensation of an ester with a metallated imine, has been developed. The intermediate vinylogous amides react smoothly with hydroxylamine to provide, after dehydration, substituted isoxazoles. The method has been used for the multi-kilo scale preparation of ABT-418, a novel cholinergic channel activator.
In the presence of a supported gold–palladium alloy nanoparticle catalyst (Au–Pd/Al2O3), various kinds of N-substituted anilines can be synthesized from non-aromatic compounds.
Lithium Diisopropylamide-Mediated Lithiations of Imines: Insights into Highly Structure-Dependent Rates and Selectivities
作者:Songping Liao、David B. Collum
DOI:10.1021/ja030409z
日期:2003.12.1
reactivities including: (a) axial versus equatorial disposition of the proton on the cyclohexane ring, (b) syn versus anti orientation of the lithiation relative to the N-alkyl group, (c) the presence or absence of a potentially chelating methoxy moiety on the N-alkyl group, (d) the presence of a 2-methyl substituent at the geminal or distal alpha-carbon, and (e) branching in the N-alkyl group. The isolated contributions