Two New Dinuclear Sterically Crowded Cu
<sup>II</sup>
Complexes as Catalyst Precursors for the Oxidative Coupling of 2,6‐Dimethylphenol
作者:Guillem Aromí、Patrick Gamez、Huub Kooijman、Anthony L. Spek、Willem L. Driessen、Jan Reedijk
DOI:10.1002/ejic.200390181
日期:2003.4
The molecular structure and spectroscopic properties of the first two bis(μ-η1-nitrato)-bridged, dinuclearCucomplexes containing 4,4′-biimidazole ligands are presented. 1H NMR, EPR, and UV/Vis spectroscopy indicate that their solid-state structure is not retained in solution. Dioxygen uptake measurements show that the presence of a methyl group at the 2-position of the imidazole rings leads to a
Asymmetric Synthesis of 2-Acetyl-4(5)-(1,2,4-trihydroxybutyl)imidazoles
作者:Matthew D. Cliff、Stephen G. Pyne
DOI:10.1021/jo00113a016
日期:1995.4
A method for preparing trihydroxybutyl analogues of the biologically active compound 2-acetyl-4(5)-(1,2,3,4-tetrahydroxybutyl)imidazole (THI) is reported. This method employs a palladium(0)catalyzed coupling of 1-(ethoxymethyl)-4-iodoimidazole (3a) to functionalized vinylstannane 11, 1-alkynylstannane 16, or alkyne 10 to introduce the C-4 imidazole 4-carbon side chain, The 1,2-dihydroxyfunctionality of the butyl side chain was introduced by a Sharpless catalytic asymmetric dihydroxylation.