Iridium-Catalyzed Direct C–H Sulfamidation of Aryl Nitrones with Sulfonyl Azides at Room Temperature
作者:Chao Pi、Xiuling Cui、Yangjie Wu
DOI:10.1021/acs.joc.5b01377
日期:2015.8.7
Ir(III)-catalyzed direct C–H sulfamidation of aryl nitrones has been developed to synthesize various sulfamidated nitrones in moderate to excellent yields with excellent regioselectivity and broad functional group tolerance. This transformation could proceed smoothly at roomtemperature with low catalyst loading in the absence of external oxidants, acids, or bases. Molecular nitrogen was released as
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.
Reactivity of Morita–Baylis–Hillman Adducts in C–H Functionalization of (Hetero)aryl Nitrones: Access to Bridged Cycles and Carbazoles
作者:Ashok Kumar Pandey、Dahye Kang、Sang Hoon Han、Heeyoung Lee、Neeraj Kumar Mishra、Hyung Sik Kim、Young Hoon Jung、Sungwoo Hong、In Su Kim
DOI:10.1021/acs.orglett.8b01910
日期:2018.8.3
nitrones with Morita–Baylis–Hillman (MBH) adducts is described. An allylated intermediate derived from aryl nitrones and MBH adducts allows the formation of bridged cyclic compounds via an exotype [3 + 2] cycloaddition. In sharp contrast, electron-rich indolinyl or aniline substrates were found to couple with MBH adducts to generate naphthalene or carbazole derivatives, respectively.