Rhodium‐Catalyzed Spirocyclic Sultam Synthesis by [3+2] Annulation with Cyclic
<i>N</i>
‐Sulfonyl Ketimines and Alkynes
作者:Lin Dong、Chuan‐Hua Qu、Ji‐Rong Huang、Wei Zhang、Qian‐Ru Zhang、Jin‐Gen Deng
DOI:10.1002/chem.201303372
日期:2013.12.2
Atom‐economical addition: RhIII‐catalyzed “Grignard‐type” cyclization between cyclic N‐sulfonyl ketimines and internal alkynes has been developed to afford multifunctional spirocyclic sultam products in high yields (up to 99 %) under mild conditions (see scheme, Cp* = pentamethylcyclopentadienyl, DCE = 1,2‐dichloroethane).
importance. An attractive strategy is the arylation of imines with organoboronreagents. Chiral Rh complexes have reached a high level of productivity for this reaction type. In this article we describe that an electron rich PdII catalyst also performs well in the arylation of aldimines, comparable to the best Rh catalysts. The ferrocenyl palladacycle‐acetate catalyst allows for a broad substrate scope and
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.
An efficient rhodium(III)‐catalyzed tandem three‐component reaction of imines, alkynes and aldehydes through CHactivation has been developed. High stereo‐ and regioselectivity, as well as good yields were obtained in most cases. The simple and atom‐economical approach offers a broad scope of substrates, providing polycyclic skeletons with potential biological properties.
Rh(III)‐Catalyzed Ring‐Opening Addition of Azabenzonorbornadienes with Cyclic
<i>N</i>
‐Sulfonyl Ketimines
<i>via</i>
C−H Bond Activation
作者:Xuexin Zhang、Yang Gao、Jingchao Chen、Ruifeng Fan、Guangrui Shi、Zhenxiu He、Baomin Fan
DOI:10.1002/adsc.201900622
日期:2019.10.8
The rhodium(III)‐catalyzed ring‐opening addition of the cyclic N‐sulfonyl ketimines with azabenzonorbornadienes via C−H activation was developed. The reactions afforded the corresponding 2‐aryldihydronaphthalenes derivatives in good yield (up to 98%) under redox‐neutral conditions.