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Gold(III) N-Heterocyclic Carbene Complexes Mediated Synthesis of beta-Enaminones From 1,3-Dicarbonyl Compounds and Aliphatic Amines

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Title Gold(III) N-Heterocyclic Carbene Complexes Mediated Synthesis of beta-Enaminones From 1,3-Dicarbonyl Compounds and Aliphatic Amines
 
Creator SAMANTARAY, MK
DASH, C
SHAIKH, MM
PANG, KL
BUTCHER, RJ
GHOSH, P
 
Subject RING-OPENING POLYMERIZATION
SOLVENT-FREE CONDITIONS
MIXED AQUEOUS-MEDIUM
GOLD CATALYSIS
EFFICIENT SYNTHESIS
TRANSITION-METAL
C-C
PALLADIUM COMPLEXES
IONIC LIQUID
L-LACTIDE
 
Description A series of gold(III) N-heterocyclic carbene complexes [1-(R(1))-3-(R(2))imidazol-2-ylidene]AuBr(3) [R(i) = i-Pr, R(2) = CH(2)Ph (1c); R(1) = mesityl, R(2) = CH(2)Ph (2c); R(1) = i-Pr, R(2) = CH(2)COt-Bu (3c), and R(1) = t-Bu, R(2) = CH(2)COt-Bu (4C)] act as effective precatalysts in the synthesis of beta-enaminones from 1,3-dicarbonyl compounds and primary amines under ambient conditions. Specifically the 1c-4c complexes efficiently catalyzed the condensation of a variety of cyclic as well as acyclic 1,3-dicarbonyl compounds, namely, acetyl acetone, benzoylacetone, 2-acetylcyclopentanone, and ethyl-2-oxocyclopentanecarboxylate with primary aliphatic amines, viz., methylamine, ethylamine, n-propylamine, i-propylamine, and n-butylamine, yielding beta-enamines at room temperature. Interestingly enough, the more electrophilic gold(III) 1c-4c complexes exhibited superior activity in comparison to the gold(I) counterparts 1b-4b. A comparison along a representative 4a-c series further underscored the importance of gold in the reaction as both the gold(I) 4b and gold(III) 4c complexes were more effective than the silver analogue 4a. The density functional theory (DFT) study revealed that the strong a-donating nature of the N-heterocyclic carbene ligand results in a strong C(carbene) -Au(III) interaction in the 1c-4c complexes.
 
Publisher AMER CHEMICAL SOC
 
Date 2012-06-26T08:48:12Z
2012-06-26T08:48:12Z
2011
 
Type Article
 
Identifier INORGANIC CHEMISTRY,50(5)1840-1848
0020-1669
http://dx.doi.org/10.1021/ic102268n
http://dspace.library.iitb.ac.in/jspui/handle/100/14221
 
Language English