Mg/Triethylammonium Formate: A Useful System for Reductive Dimerization of Araldehydes into Pinacols; Nitroarenes into Azoarenes and Azoarenes into Hydrazoarenes
作者:M. GEETA PAMAR、P. GOVENDER、K. MUTHUSAMY、RUI W. M. KRAUSE、H.M. NANJUNDASWAMY
DOI:10.13005/ojc/290316
日期:2013.9.30
of triethylammoniumformate in the presence of magnesium for the efficient intermolecular pinacol coupling using MeOH as solvent. Various aromatic carbonyls underwent smooth reductive coupling to give the corresponding 1,2-diols. A series of azo compounds were obtained by the reductive coupling of nitroaromatics while azo compounds were reduced to the corresponding hydrazoarenes by this system. There
Rapid Oxidation of 1,2-Diols,<i>α</i>-Hydroxyketones and Some Alcohols using<i>N</i>-Bromosuccinimide in Ionic Liquid
作者:Jitender M. Khurana、Ankita Chaudhary、Sanjay Kumar
DOI:10.1080/00304948.2013.786585
日期:2013.5.4
Oxidation of 1,2-diols, α-hydroxyketones and alcohols to carbonyl compounds is of great importance in organic synthesis1 and can be achieved with an array of reagents such as chromium(VI)-based reagents,2 hypervalent iodine reagents,3 and DABCO/Br2, DMSO/N2H4.H2O/I2/H2O/CH3CN. The oxidation of α-hydroxyketones to 1,2-diketones has also been reported by a variety of reagents including pyridinium chlorochromate
The metal-free thermal organocatalytic pinacolcoupling of arylaldehydes has been developed. The intermolecular coupling of arylaldehydes catalyzed by t-butyl isonicotinate with bis(pinacolato)diboron as the co-reducing agent afforded 1,2-diphenylethane-1,2-diols. This reaction was also applicable to the intramolecular coupling of 1,1′-biphenyl-2,2′-dicarbaldehydes to afford 9,10-dihydrophenanthrene-9
A novel method of synthesis of 1,2-diketones from 1,2-diols using N-bromosuccinimide
作者:Jitender M Khurana、Bhaskar M Kandpal
DOI:10.1016/s0040-4039(03)01075-x
日期:2003.6
A simple and convenient procedure is reported for the synthesis of benzils and aliphatic 1,2-diketones of cyclic and open chain compounds from corresponding hydrobenzoins and 1,2-diols by refluxing with N-bromosuccinimide in carbon tetrachloride in presence or absence of pyridine.
A simple and efficient method has been developed for the synthesis of fusedpyranobiscoumarins using lead tetraacetate as an oxidizing agent by the condensation of one equivalent of 1,2‐diols and four equivalent of 4‐hydroxy coumarin in acetonitrile as solvent at 80°C with good to excellent yields.