Oxidative dimerization of primary alcohols with 2-butanone in the presence of an amino alcohol-based Ir bifunctional catalyst was accomplished for the first time. The reaction proceeds with 1-2 mol% of the catalyst and 0.3 mol equivalents of K2CO3 in 2-butanone at room temperature to give the corresponding dimeric esters in 30-93% yield.
Oxoammonium Salts. 9. Oxidative Dimerization of Polyfunctional Primary Alcohols to Esters. An Interesting β Oxygen Effect
作者:Nabyl Merbouh、James M. Bobbitt、Christian Brückner
DOI:10.1021/jo049461j
日期:2004.7.1
The use of the oxidant 4-acetylamino-2,2,6,6-tetramethylpiperidine-1-oxoammonium tetrafluoroborate in combination with pyridine for the oxidative, dimeric esterification of primary alcohols is described. The ester is the predominant product of the reaction with alcohols containing a β oxygen. In the absence of a β oxygen, the corresponding aldehyde is found in appreciable amounts, but a concentration
2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO) catalyzes the direct oxidation of primary alkyl alcohols to symmetric esters at 1-2 mol% loadings. These rapid reactions take place at room temperature to afford the products in yields of 55-99%.