Investigation of Additive Effects in Enantioselective Copper-Catalysed C-H Insertion and Aromatic Addition Reactions of α-Diazocarbonyl Compounds
作者:Anita Maguire、Catherine Slattery、Leslie-Ann Clarke、Shane O'Neill、Aoife Ring、Alan Ford
DOI:10.1055/s-0031-1290598
日期:2012.3
Irish Research Council for Science, Engineering and Technology (Programme for Research in Third Level Institutions Cycle 4); Eli Lilly and Company, United States
爱尔兰科学、工程和技术研究委员会(第三级机构研究计划周期 4);美国礼来公司
Asymmetric copper-catalysed intramolecular C–H insertion reactions of α-diazo-β-keto sulfones
作者:Catherine N. Slattery、Anita R. Maguire
DOI:10.1039/c0ob00914h
日期:——
Asymmetric copper-catalysed intramolecular C–Hinsertionreactions of a series of α-diazo-β-keto sulfones are reported. Enantioselectivities of up to 82% ee were achieved in moderate to good yield. These results represent the highest level of enantiocontrol achieved to date for a copper-catalysed cyclopentanone synthesis via C–Hinsertion.
Catalyst, additive and counterion effects on the efficiency and enantioselectivity of copper-catalysed C–H insertion reactions of α-diazosulfones
作者:Catherine N. Slattery、Leslie-Ann Clarke、Alan Ford、Anita R. Maguire
DOI:10.1016/j.tet.2012.12.003
日期:2013.1
Asymmetric copper-catalysed intramolecular C–Hinsertionreactions of α-diazosulfones in the presence of various group I salts are reported leading to substantial variation in reaction efficiencies and enantioselectivities. The borate additives NaBARF and KBARF were found to be the most effective additives for permitting highly enantioselective syntheses with short reactions times and high efficiency
Synthetic and Mechanistic Aspects on the Competition between C–H Insertion and Hydride Transfer in Copper-Mediated Transformations of α-Diazo-β-Keto Sulfones
作者:Anita Maguire、Catherine Slattery、Alan Ford、Kevin Eccles、Simon Lawrence
DOI:10.1055/s-0033-1340471
日期:——
Competition between C–Hinsertion and hydride transfer is reported for the copper-catalysedreactions of a range of phenyl-substituted α-diazo-β-keto sulfones. Control of chemoselectivity is possible by alteration of the electronic properties of the diazo substrate. The production of enantioenriched cyclopentanones (up to 89% ee), formed via C–Hinsertion, and alkylidene tetrahydrofurans (up to 43%
Electronic effects of aryl-substituted bis(oxazoline) ligands on the outcome of asymmetric copper-catalysed C–H insertion and aromatic addition reactions
作者:Catherine N. Slattery、Sarah O’Keeffe、Anita R. Maguire
DOI:10.1016/j.tetasy.2013.09.009
日期:2013.10
The effect of the modification of bis(oxazoline) ligands on the outcome of copper-catalysed C-H insertion and aromatic addition reactions is described. In general, these reactions display minimum sensitivity in terms of enantiocontrol to variation of the electronic properties of the aryl moiety of the ligand however, some influence is observed for C-H insertions employing naphthyl-substituted bis(oxazolines) and for aromatic addition reactions of biphenyl diazo ketone substrates. The synthesis of the modified bis(oxazolines), which include four novel structures, is also described. (C) 2013 Elsevier Ltd. All rights reserved.