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.
Eight‐Membered Palladacycle Intermediate Enabled Synthesis of Cyclic Biarylphosphonates
作者:Xin‐Xin Yang、Ming‐Ying Wu、Shao‐Qiu Wang、Shang‐Dong Yang
DOI:10.1002/chem.202302416
日期:2024.1.11
palladium-catalyzed intramolecular C−H bond arylation of triarylphosphonate is reported to access cyclic biarylphosphonates targets. The reaction is achieved via an unique eight-membered palladacycleintermediate and show good functional group compatibility under mild reaction condition.