Application of neutral iridium(I)<i>N</i>-heterocyclic carbene complexes in<i>ortho</i>-directed hydrogen isotope exchange
作者:Alison R. Cochrane、Stephanie Irvine、William J. Kerr、Marc Reid、Shalini Andersson、Göran N. Nilsson
DOI:10.1002/jlcr.3084
日期:2013.7
Bench-stable complexes of the type [Ir(COD)(NHC)Cl] (NHC = N-heterocyclic carbene) have been investigated within the field of hydrogenisotopeexchange. By employing a sterically encumbered NHC within such complexes and catalyst loadings of only 5 mol%, moderate to high deuterium incorporations were achieved across a range of aromatic ketones and nitrogen-based heterocycles. The simple and synthetically
Highly active iridium(i) complexes for catalytic hydrogen isotope exchange
作者:Jack A. Brown、Stephanie Irvine、Alan R. Kennedy、William J. Kerr、Shalini Andersson、Göran N. Nilsson
DOI:10.1039/b715938b
日期:——
Practically convenient methods have been developed for the preparation of new iridiumcomplexes, possessing bulky N-heterocyclic carbene and phosphine ligands; these routinely handled complexes are highly active catalysts within directed hydrogenisotopeexchange processes.
of conditions allows for exclusive labeling of the α-carbonyl position while a procedure for the preparation of merely ortho-deuterated compounds is also reported. This methodology proceeds with good functional group tolerance and can be also applied for deuteration of pharmaceutical drugs. Mechanistic studies reveal a kinetic isotope effect of 2.2, showing that the C−H activation is likely the rate-determining