New Synthesis of 2-Alkyl-4,4-dimethyl-5-halomethylisoxazolidin-3-ones via Intramolecular Halocyclization of N-Alkyl-2,2-dimethyl-3-butenohydroxamic Acids
Metal-Free, Aerobic Dioxygenation of Alkenes Using Hydroxamic Acids
作者:Valerie A. Schmidt、Erik J. Alexanian
DOI:10.1002/anie.201000843
日期:2010.6.14
One dioxygenation please, hold the metal: In the presence of either oxygen or air as the sole oxidant and external oxygen atom source, a variety of unsaturated hydroxamicacids afford cyclic hydroxamates that are readily converted into 1,2‐diols, with the potential for high levels of reaction stereocontrol.
Alkene Hydrofunctionalization Using Hydroxamic Acids: A Radical-Mediated Approach to Alkene Hydration
作者:Benjamin C. Giglio、Erik J. Alexanian
DOI:10.1021/ol5020202
日期:2014.8.15
A radical-mediated approach to alkene hydration is described. The present strategy capitalizes on the unique radical reactivity of hydroxamicacids, which are capable of functioning as both synthetically useful oxygen-centered radical species and suitable hydrogen atom-based donors. This reaction manifold has been applied to both alkene hydrations and tandem alkene–alkene carbocyclization processes
Metal-Free Oxyaminations of Alkenes Using Hydroxamic Acids
作者:Valerie A. Schmidt、Erik J. Alexanian
DOI:10.1021/ja204255e
日期:2011.8.3
A radical-mediated approach to metal-freealkene oxyamination is described. This method capitalizes on the unique reactivity of the amidoxyl radical in alkene additions to furnish a general difunctionalization using simple diisopropyl azodicarboxylate (DIAD) as a radical trap. This protocol capitalizes on the intramolecular nature of the process, providing single regioisomers in all cases. Difunctionalizations
Neutral Nazarov-Type Cyclization Catalyzed by Palladium(0)
作者:Naoyuki Shimada、Craig Stewart、William F. Bow、Anais Jolit、Kahoano Wong、Zhe Zhou、Marcus A. Tius
DOI:10.1002/anie.201201724
日期:2012.6.4
Joining the circle: The first Pd0 catalyzed Nazarov‐type cyclization of diketoesters (see scheme) proceeds in 70 % to 95 % yield under strictly neutral pH conditions. Aryl substitution of the diketoesters is not required, so the reaction shows great versatility and can also proceed with aliphatic substrates.