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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/13849

Title: Gold(III) N-Heterocyclic Carbene Complexes Mediated Synthesis of beta-Enaminones From 1,3-Dicarbonyl Compounds and Aliphatic Amines
Authors: SAMANTARAY, MK
DASH, C
SHAIKH, MM
PANG, KL
BUTCHER, RJ
GHOSH, P
Keywords: RING-OPENING POLYMERIZATION
SOLVENT-FREE CONDITIONS
MIXED AQUEOUS-MEDIUM
GOLD CATALYSIS
EFFICIENT SYNTHESIS
TRANSITION-METAL
C-C
PALLADIUM COMPLEXES
IONIC LIQUID
L-LACTIDE
Issue Date: 2011
Publisher: AMER CHEMICAL SOC
Citation: INORGANIC CHEMISTRY,50(5)1840-1848
Abstract: 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.
URI: http://dx.doi.org/10.1021/ic102268n
http://dspace.library.iitb.ac.in/jspui/handle/100/13849
ISSN: 0020-1669
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