The palladium‐catalyzed hydroesterification reaction was performed with polyols and olefins in a liquid/liquid biphasic system composed of unreacted polyol on the one hand and apolar reaction products/organic solvents on the other hand. The palladium‐based catalyst was immobilized in the polyolphase thanks to the use of cationic triarylphosphines possessing pendent protonated amino groups in the acidic
Facile oxidative hydrolysis of acetals to esters using hypervalent iodine(III)/LiBr combination in water
作者:Waraporn Panchan、Supanimit Chiampanichayakul、Deanna L. Snyder、Siriporn Yodbuntung、Manat Pohmakotr、Vichai Reutrakul、Thaworn Jaipetch、Chutima Kuhakarn
DOI:10.1016/j.tet.2010.01.098
日期:2010.4
The combination of (diacetoxy)iodobenzene (Phl(OAc)(2), DIB) and lithium bromide (LiBr) efficiently oxidized cyclic and acyclic acetals to the corresponding hydroxyalkyl carboxylic esters and simple esters in good to excellent yields The merits of this reaction are that it employs commercially available and non-explosive hypervalent iodine(III) reagent, water as the solvent, a short reaction tune, and mild reaction conditions (C) 2010 Elsevier Ltd All rights reserved