Thermodynamic, spectroscopic, and density functional theory studies of allyl aryl and prop-1-enyl aryl ethers. Part 1. Thermodynamic data of isomerization
The microwave-accelerated Claisen rearrangement of allyl aryl ethers was investigated, in order to gain insight into the scope of the catalysts, solvents, temperatures, and substrates. Among the catalysts examined, phosphomolybdic acid (PMA) was found to greatly accelerate the reaction in NMP, at temperatures ranging from 220 to 300 °C. This method was found to be useful for preparing several intermediates
Allyl arylethers and allyl phenol derivatives were prepared starting from commercial or synthetized phenols. Either Williamson reaction or Et2AlCl catalyzed Claisen rearrangement was performed to obtain the polyoxygenated molecules. The pivotal allyl phenols were then modified by methylation, iodocyclization or electrophilic aromatic iodination to afford the polyoxygenated derivatives in good to excellent
Improved Cs<sub>2</sub>Co<sub>3</sub> Promoted <i>O</i>-Alkylation of Phenols
作者:Jay P. Parrish、Bhuvana Sudaresan、Kyung Woon Jung
DOI:10.1080/00397919908086606
日期:1999.12.1
Cesium carbonate mediated O-alkylation of phenols was carried out under mild conditions to give the corresponding phenol ethers exclusively. The methodology is more efficient than previous methods since harsh conditions such as higher temperatures and longer reaction times are avoided.