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.
Nitrone Directing Groups in Rhodium(III)-Catalyzed C−H Activation of Arenes: 1,3-Dipoles versus Traceless Directing Groups
作者:Fang Xie、Songjie Yu、Zisong Qi、Xingwei Li
DOI:10.1002/anie.201609658
日期:2016.12.5
Functionalizable directing groups (DGs) are highly desirable in C−H activation chemistry. The nitrone DGs are explored in rhodium(III)‐catalyzedC−H activation of arenes and couplings with cyclopropenones. N‐tert‐butyl nitrones bearing a small ortho substituent coupled to afford 1‐naphthols, where the nitrone acts as a traceless DG. In contrast, coupling of N‐tert‐butyl nitrones bearing a bulky ortho
Regio- and Diastereoselective Access to Fused Isoxazolidines via Ru(II)-Catalyzed C–H Activation of Nitrones and Coupling with Perfluoroalkylolefins
作者:Yunyun Li、Fang Xie、Yuan Liu、Xifa Yang、Xingwei Li
DOI:10.1021/acs.orglett.7b03775
日期:2018.1.19
synthsis of fluorinated isoxazolidines in bicyclic settings has been realized via Ru(II)-catalyzed C–H activation of aryl nitrones with perfluoroalkyl-substituted olefins as the coupling partner. The reaction proceeded via initial chelation-assisted C(aryl)–H allylation followed by regio- and diastereoselective intramolecular dipolar addition between the nitrone directing group and the olefin unit.
Synthesis of 2-arylethenesulfonyl fluorides and isoindolinones: Ru-catalyzed C–H activation of nitrones with ethenesulfonyl fluoride
作者:Tong-Tong Wang、Li-Ming Zhao
DOI:10.1039/d2cc03418b
日期:——
2-arylethenesulfonyl fluorides from nitrones and ethenesulfonyl fluoride (ESF) by the activation of the C–H bond using an inexpensive and readily available Ru-catalyst has been developed. In this process, the directing group can be concomitantly converted to an amide group. Interestingly, changing the substituent of the nitrogen of nitrones from a tert-butyl to a methyl group resulted in the formation of cyclic isoindolinones