Silver-Catalyzed Enantioselective Propargylation Reactions of <i>N</i>-Sulfonylketimines
作者:Charlotte A. Osborne、Thomas B. D. Endean、Elizabeth R. Jarvo
DOI:10.1021/acs.orglett.5b02692
日期:2015.11.6
The enantioselective silver-catalyzed propargylation of N-sulfonylketimines is described. This reaction proceeds in high yield and excellent enantiomeric ratio and is compatible with a wide variety of diaryl- and alkylketimines. Synthetic transformations of homopropargylic products via enyne ring-closing metathesis, Sonogashira cross-coupling, and reduction reactions proceed with high stereochemical
Spirocyclic Sultam and Heterobiaryl Synthesis through Rh-Catalyzed Cross-Dehydrogenative Coupling of <i>N</i>-Sulfonyl Ketimines and Thiophenes or Furans
A useful approach is developed for the synthesis of various structurally interesting spirocyclic sultams and heterobiaryls using a cross-dehydrogenative coupling strategy that features high atom and step economy. This method employs [Cp*RhCl2]2 as a catalyst and N-sulfonylimine, a weak coordinating group, as an efficient directing group to assist C–H activation. A number of the coupled products were
Rhodium-catalysed direct C–H allylation of N-sulfonyl ketimines with allyl carbonates
作者:Shu-Tao Mei、Nan-Jin Wang、Qin Ouyang、Ye Wei
DOI:10.1039/c4cc09899d
日期:——
Synthetically useful N-sulfonyl ketimines were efficiently allylated with various allyl carbonates through rhodium catalysis.
合成上有用的N-磺酰基酮亚胺可通过铑催化与各种烯丙基碳酸酯有效地发生烯丙基化反应。
Iridium-catalyzed direct C–H arylation of cyclic <i>N</i>-sulfonyl ketimines with arylsiloxanes at ambient temperature
作者:Writhabrata Sarkar、Arup Bhowmik、Sumit Das、Aiswarya Balaram Sulekha、Aniket Mishra、Indubhusan Deb
DOI:10.1039/d0ob01212b
日期:——
A highly efficient iridium-catalyzed ortho-selective C–H arylation of weakly coordinating cyclic N-sulfonyl ketimines has been achieved with environmentally benign aryl siloxanes at ambient temperature giving access to a novel class of biaryls.
Rh(III)-Catalyzed Diastereodivergent Spiroannulation of Cyclic Imines with Activated Alkenes
作者:Bingxian Liu、Panjie Hu、Ying Zhang、Yunyun Li、Dachang Bai、Xingwei Li
DOI:10.1021/acs.orglett.7b02678
日期:2017.10.6
Rh(III)-catalyzed [3 + 2] annulation of cyclic N-sulfonyl or N-acyl ketimines with activated alkenes has been realized, leading to the synthesis of spirocycles with three continuous stereogenic centers. This atom-economic reaction proceeded efficiently under mild and redox-neutral conditions via a C–H activation pathway, and the coupling is diastereodivergent, with the diastereoselectivity being controlled