Transition Metal-Free TEMPO-Catalyzed Oxidative Cross- Coupling of Nitrones with Alkynyl-Grignard Reagents
作者:Sandip Murarka、Armido Studer
DOI:10.1002/adsc.201100327
日期:2011.10
cross-coupling of nitrones and alkynyl-magnesium compounds using a catalytic amount of 2,2,6,6-tetramethylpiperidine-N-oxyl radical (TEMPO) as an environmentally benign organic oxidant and dioxygen as terminal oxidant is described. These coupling reactions can be performed without adding any transition metal on various N-tert-butylnitrones and alkynyl-Grignardreagents. Moreover, the alkynylated nitrone products
Palladium-catalyzed C–H alkenylation of C-aryl N-t-butyl nitrones with ethyl acrylate produced ortho-alkenylated benzamide derivatives via isomerization of the nitrone moiety. The use of 1,1,1,3,3,3-hexafluoro-2-propanol/acetic acid as a solvent resulted in effective C–H alkenylation, while competitive 1,3-dipolar cycloaddition was completely suppressed.
Iridium(III)-Catalyzed C–H Amidation of Nitrones with Dioxazolones
作者:Xia Mi、Weisheng Feng、Chao Pi、Xiuling Cui
DOI:10.1021/acs.joc.9b00300
日期:2019.5.3
efficiently achieved through Ir(III)-catalyzed direct C–H amidation of nitrones with good to excellent yields and tolerance of broad functional groups. This reaction smoothly proceeded at roomtemperature in the absence of acid or base in a short reaction time. Carbon dioxide was generated as the sole byproduct, thus providing an environmentally benign amidation process. The title products could be efficiently
Substituent effects on ESR parameters of α-phenyl-N-tert-butylnitrone spin adducts. Resolution enhancement and mass spectrometry
作者:Kai Pan、Chiou-Rong Lin、Tong-Ing Ho
DOI:10.1002/mrc.1260310705
日期:1993.7
The combination of high‐performance liquid chromatography (HPLC) and ESR spectrometry was used to isolate the free radicals produced by the reaction of a Grignard reagent with 15 substituted α‐Phenyl‐N‐tert‐butylnitrone. Long‐range hyperfine splitting constants (hfsc) were obtained by the resolution enhancement method. Linear correlation studies between hfsc and Hammett σp constants are reported. Dual‐parameter
COMPOSITIONS AND METHODS OF INHIBITING RETINAL DEGENERATION
申请人:Anderson Robert E.
公开号:US20130225694A1
公开(公告)日:2013-08-29
Nitrone-based compositions are disclosed that may be utilized for the prevention and treatment of a variety of ophthalmic diseases or conditions where RPE65 protein isomerohydrolase is implicated. Methods of production and use of said nitrone-based compositions, as well as pharmaceutical and ophthalmic compositions containing same, are disclosed.