A simple one‐pot procedure for the preparation of 2,4,5‐triphenyl imidazole derivatives is presented. The procedure involves the lead tetraacetate oxidation of 1,2‐diols to give aldehydes in situ, which then undergo a three‐component reaction with benzil and ammonium acetate to yield the imidazole derivatives.
Pinacol coupling of aromatic aldehydes was efficientlypromoted by titanium tetraiodide in propionitrile to give the 1,2-diol derivatives with high dl-selectivities in high yields.
Ruthenium Catalyzed Oxidation of 1,2‐Diols to 1,2‐Diketones Using Bromamine‐T as an Oxidizing Agent
作者:Suman L. Jain、Vishal B. Sharma、Bir Sain
DOI:10.1081/scc-200048974
日期:2005.1.1
A variety of 1,2-diols were selectively oxidized to their corresponding 1,2-diketones with bromamine-T using RuCl3 . xH(2)O as catalyst in alkaline acetonitrile/water (1 : 1) medium. The reaction was pH dependent (pH 8.4), and at higher pH the rate of the reaction decreased significantly.
Methyltrioxorhenium catalyzed oxidation of 1,2-diols to 1,2-diketones using hydrogen peroxide as oxidant
作者:Suman L. Jain、Vishal B. Sharma、Bir Sain
DOI:10.1016/j.tetlet.2003.11.131
日期:2004.2
A variety of 1,2-diols were oxidized selectively to the corresponding 1,2-diketones by the dropwise addition of 30% aqueous hydrogen peroxide using methyltrioxorhenium as catalyst. (C) 2003 Elsevier Ltd. All rights reserved.