Catalyst-Controlled Aliphatic C–H Oxidations with a Predictive Model for Site-Selectivity
作者:Paul E. Gormisky、M. Christina White
DOI:10.1021/ja407388y
日期:2013.9.25
Selective aliphaticC-H bond oxidations may have a profound impact on synthesis because these bonds exist across all classes of organic molecules. Central to this goal are catalysts with broad substrate scope (small-molecule-like) that predictably enhance or overturn the substrate's inherent reactivity preference for oxidation (enzyme-like). We report a simple small-molecule, non-heme iron catalyst that
申请人:The Board of Trustees of the University of Illinois
公开号:US09925528B2
公开(公告)日:2018-03-27
The invention provides simple small molecule, non-heme iron catalyst systems with broad substrate scope that can predictably enhance or overturn a substrate's inherent reactivity preference for sp3-hybridized C—H bond oxidation. The invention also provides methods for selective aliphatic C—H bond oxidation. Furthermore, a structure-based catalyst reactivity model is disclosed that quantitatively correlates the innate physical properties of the substrate to the site-selectivities observed as a function of the catalyst. The catalyst systems can be used in combination with oxidants such as hydrogen peroxide to effect highly selective oxidations of unactivated sp3 C—H bonds over a broad range of substrates.
Microbial transformations of artemisinin 1 by Cunninghamella echinulata (AS 3.3400) and Aspergillusniger (AS 3.795) were carried out. Two products, 10β-hydroxyartemisinin 2 and 3α-hydroxydeoxyartemisinin 3, were obtained. Their structures were identified on the basis of chemical and spectroscopic data. 10β-Hydroxyartemisinin is a new compound.
申请人:THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
公开号:US20160214097A1
公开(公告)日:2016-07-28
The invention provides simple small molecule, non-heme iron catalyst systems with broad substrate scope that can predictably enhance or overturn a Substrate Control Catalyst Control substrate's inherent reactivity preference for sp3-hybridized C—H bond oxidation. The invention also provides methods for selective aliphatic C—H bond oxidation. Furthermore, a structure-based catalyst reactivity model is disclosed that quantitatively correlates the innate physical properties of the substrate to the site-selectivities observed as a function of the catalyst. The catalyst systems can be used in combination with oxidants such as hydrogen peroxide to effect highly selective oxidations of unactivated sp3 C—H bonds over a broad range of substrates.
The Fe(PDP)-catalyzed aliphatic C–H oxidation: a slow addition protocol
作者:Nicolaas A. Vermeulen、Mark S. Chen、M. Christina White
DOI:10.1016/j.tet.2008.11.082
日期:2009.4
This report describes a slow addition protocol for the Fe(PDP)-catalyzecl aliphatic C-H oxidation reaction. Under this protocol, the reaction can be productively driven to higher conversions without decreasing site-selectivity or chemoselectivity. The operational advantages of this procedure are highlighted in the oxidation of two complex natural product derivatives. Hydroxylated products can be obtained in high isolated yields without the need for recycling recovered starting materials. (C) 2008 Published by Elsevier Ltd.