作者:Jonathan T. Reeves、Chris Lorenc、Kaddy Camara、Zhibin Li、Heewon Lee、Carl A. Busacca、Chris H. Senanayake
DOI:10.1021/jo500848a
日期:2014.6.20
The addition of carbamoyl anions derivedfrom N,N-disubstituted formamides and LDA to N-tert-butyl nitrones is described. The reaction was demonstrated with a variety of formamides and nitrones and provided a direct route to α-(N-hydroxy)amino amides. The use of a tert-leucinol derivedchiralauxiliary on the nitrone provided products in good diastereoselectivity. Derivatization of the products by
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
1H and13C NMR Spectra of (Z)-C-arylN-tert-butyl nitrones
作者:Robert W. Murray、Megh Singh
DOI:10.1002/mrc.1260290917
日期:1991.9
The 1H and 13C NMR spectra of 12 (Z)‐C‐aryl N‐tert‐butyl nitrones were measured and proton and carbon assignments made. The nitrones were synthesized by the dimethyldioxirane method.