Some mixed phosphites having two different alkyl chain were obtained as forerunners for mixed phosphates Mixed dialkylphosphates were obtained in good yields (40-80%) by phase transfer catalysis in liquid-liquid sistem, starting from different dialkylphosphites and aliphatic alcohols. The reaction conditions were optimized in order to obtain good yields in phosphites and phosphates respectively.
An Improved Method for Lewis Acid Catalyzed Phosphoryl Transfer with Ti(<i>t</i>-BuO)<sub>4</sub>
作者:Simon Jones、Dimitrios Selitsianos、Kate J. Thompson、Steven M. Toms
DOI:10.1021/jo034331g
日期:2003.6.1
Several inorganic esters have been evaluated as phosphoryl transfer catalysts. Of these, Ti(t-BuO)(4) was found to be the most effective catalyst giving excellent yields of the desired phosphate esters. The loading of the catalyst could be reduced to a little as 5 mol % for a majority of substrates with no loss in the yield of product. This methodology is significantly more versatile than using TiCl4 and is suitable for the phosphorylation of more complex carbohydrates and molecules of biological interest.