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).
N‐tosylarylimines and alkynes via ruthenium(II)‐catalyzed CH bond activation and annulation is described. The catalytic reaction proceeds well with a broad substrate scope and in good yields. A possible mechanism is proposed that involves imine nitrogen chelation‐assisted ortho‐CH bond activation of the substrate, alkyne insertion, and intramolecular insertion of the CN Ts group into the CRu bond. Isotope‐labeling
Catalytic [3 + 2] annulation of ketimines with alkynes via C–H activation by a cationic iridium(cod) complex
作者:Midori Nagamoto、Takahiro Nishimura
DOI:10.1039/c4cc01874e
日期:——
[3 + 2] Annulation of ketimines with internal and terminal alkynes proceeded via CâH activation to give aminoindene derivatives in high yields, which is catalyzed by a cationic iridium complex coordinated with 1,5-cyclooctadiene (cod).
Continuous Flow Chemistry Synthesis of Spirocyclic Sultams and Isoquinolines through Rhodium‐Catalyzed C−H Activation.
作者:Ting Zheng、Meng‐Ling Lin、Lin Dong
DOI:10.1002/ejoc.202201170
日期:2022.12.19
Continuousflow technology has been applied to C−H activation to improve reaction efficiency. Various imines and alkynes have been smoothly applied to continuousflow system, and the spirocyclic sultams and isoquinolines can be obtained in excellent yields in a relatively short time via [3+2] or [4+2] annulation reactions.