chromatography (HPLC) and ESR spectrometry was used to isolate the radical products obtained by photolysis of o‐methylbenzaldehyde (1), o‐methylacetophenone (2) and o‐methylbenzophenone (3) in the presence of α‐phenyl‐N‐tert‐butylnitrone and its derivatives (4–19). Linear correlations between the hyperfine splitting constants and the Hammett parameters are observed. The mass spectra of the HPLC–ESR isolated
Borrowing and Returning Oxygen Atom in Trifluoroacetic Anhydride Transfer to Nitrones: A Versatile Route for the Synthesis of <i>N</i>
-Trifluoroacetyl Amides
作者:Junwen Wang、Zhiqiang Weng
DOI:10.1002/ejoc.201801662
日期:2019.2.14
A variety of N‐trifluoroacetyl amides are obtained from trifluoroaceticanhydride transfers to nitrones through borrowing and returning oxygen atom. This transformation proceeds smoothly under mild conditions via electrophilic trifluoroacetylation, followed by nucleophilicaddition and elimination, and intramolecular substitution. Furthermore, the method also provides efficient access to N‐difluoroacetyl
Access to Indenones by Rhodium(III)-Catalyzed C–H Annulation of Arylnitrones with Internal Alkynes
作者:Zisong Qi、Mei Wang、Xingwei Li
DOI:10.1021/ol4025309
日期:2013.11
Under redox-neutral conditions, rhodium(III)-catalyzed C–H annulation of N-tert-butyl-α-arylnitrones with internal alkynes has been realized for the synthesis of indenones under mild conditions. This reaction proceeded in moderate to high yields and with good functional group tolerance.
A Protocol To Transform Sulfones into Nitrones and Aldehydes
作者:Eduardo Rodrigo、Inés Alonso、M. Belén Cid
DOI:10.1021/acs.orglett.8b02483
日期:2018.9.21
A simple method to transform sulfones into nitrones and therefore into the corresponding carbonyl derivatives has been developed. Some examples demonstrate that it is a new reliable and versatile reaction in the toolbox of sulfones that has great synthetic potential. NMR and computational studies were used to elucidate the mechanism.
Rhodium(III)-Catalyzed C–H Activation of Nitrones and Annulative Coupling with Nitroalkenes
作者:Dachang Bai、Qingqian Jia、Teng Xu、Qiuqiu Zhang、Fen Wu、Chaorui Ma、Bingxian Liu、Junbiao Chang、Xingwei Li
DOI:10.1021/acs.joc.7b01574
日期:2017.9.15
Rh(III)-catalyzedsynthesis of nitro-functionalized indenes has been realized via C–Hactivation of arylnitrones and annulation with nitroolefins. The reaction proceeded in moderate to high yields with good functional group tolerance under ambient atmosphere.