Gold-Catalysed Oxyarylation of Styrenes and Mono- and<i>gem</i>-Disubstituted Olefins Facilitated by an Iodine(III) Oxidant
作者:Liam T. Ball、Guy C. Lloyd-Jones、Christopher A. Russell
DOI:10.1002/chem.201103061
日期:2012.3.5
1‐Hydroxy‐1,2‐benziodoxol‐3(1H)‐one (IBA) is an efficient terminal oxidant for gold‐catalysed, three‐component oxyarylation reactions. The use of this iodine(III) reagent expands the scope of oxyarylation to include styrenes and gem‐disubstituted olefins, substrates that are incompatible with the previously reported Selectfluor‐based methodology. Diverse arylsilane coupling partners can be employed
Gold-Catalyzed Oxidative Coupling Reactions with Aryltrimethylsilanes
作者:William E. Brenzovich、Jean-François Brazeau、F. Dean Toste
DOI:10.1021/ol102194c
日期:2010.11.5
During continuing studies with a novel oxidative gold oxyarylation reaction, arylsilanes were found to be competent coupling partners, providing further evidence for an intramolecular electrophilic aromatic substitution mechanism. While providing yields complementary to those of the previously described boronic acid methods, the use of trimethylsilanes reduces the observation of homocoupling byproducts
ipso-Fluorination of aryltrimethylsilanes using xenon difluoride
作者:Aileen P. Lothian、Christopher A. Ramsden、Maxine M. Shaw、Rachel G. Smith
DOI:10.1016/j.tet.2011.02.016
日期:2011.4
Reaction of aryltrimethylsilanes with xenondifluoride in C6F6/Pyrex® at room temperature gives aryl fluorides in good yield. The reaction is inhibited when acetonitrile is used as solvent but proceeds well in CFCl3/Pyrex® or CH2Cl2/Pyrex®. Pyrex® appears to be a very effective heterogeneous catalyst for this ipso-fluorination. The reaction does not proceed in PTFE, quartz, soda glass or glassy-carbon