Microwave-assisted free radical chemistry using the persistent radical effectElectronic Supplementary Information (ESI) available: experimental procedures and analytical data for all the described compounds. See http://www.rsc.org/suppdata/cc/b3/b313139d/
CO-Trapping Reaction under Thermolysis of Alkoxyamines: Application to the Synthesis of 3,4-Cyclopenta-1-tetralones
摘要:
An efficient one-pot sequence comprising a PRE-mediated radical 5-exo-cyclization, a radical carbonylation, a nitroxide trapping reaction, and a subsequent acid-catalyzed Friedel-Craft-type acylation provides a new entry into 3,4-cyclopenta-1-tetral ones. Eight examples are presented.
discussed. A correlation by which the rate constant for the C-O bond cleavage of TEMPO-derived alkoxyamines can be predicted from the C-H BDEs of the corresponding alkanes is presented. Solvent effects as well as the effect of camphorsulfonic acid on the rate of the C-O bond homolysis are discussed. Finally, EPR and kinetic evidence show that alkoxyamines derived from nitroxides which are capable of intramolecular
Tin-Free Radical Alkoxyamine Addition and Isomerization Reactions by Using the Persistent Radical Effect: Variation of the Alkoxyamine Structure
作者:Kian Molawi、Tobias Schulte、Kai Oliver Siegenthaler、Christian Wetter、Armido Studer
DOI:10.1002/chem.200400936
日期:2005.4.8
Various C-centered radicals can efficiently be generated through thermal C-O-bond homolysis of alkoxyamines. This method is used to perform environmentally benign radical cyclization and intermolecular addition reactions. These alkoxyamine isomerizations and intermolecular carboaminoxylations are mediated by the persistent radicaleffect (PRE). In the paper, the effect of the variation of the alkoxyamine
The Effect of Additives on TEMPO-Mediated Alkoxyamine Isomerizations: Experiments and Simulations
作者:Armido Studer、Thomas Vogler
DOI:10.1055/s-2006-950321
日期:——
Thermal radical alkoxyamine isomerizations controlled by the persistent radical effect are investigated. These processes can be accelerated upon addition of substoichiometric amounts of Lewis acids, Bronsted acids and various reducing reagents. The experimental findings are further supported by simulations.