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.
Rh(III)-Catalyzed Mild Coupling of Nitrones and Azomethine Imines with Alkylidenecyclopropanes via C–H Activation: Facile Access to Bridged Cycles
作者:Dachang Bai、Teng Xu、Chaorui Ma、Xin Zheng、Bingxian Liu、Fang Xie、Xingwei Li
DOI:10.1021/acscatal.8b00746
日期:2018.5.4
activation of nitrones and azomethine imines in the context of dipolar addition with alkylidenecyclopropanes (ACPs) have been realized. By taking advantage of the ring strain in ACPs, the reaction with aryl nitrones delivered bridged [3.2.1] bicyclicisoxazolidines, and reaction with azomethine imines afforded bridged tricyclic pyrazolones under the same conditions, where both the nitrone and azomethine