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).
Enantioselective Access to Spirocyclic Sultams by Chiral Cp<sup>x</sup>
-Rhodium(III)-Catalyzed Annulations
作者:Manh V. Pham、Nicolai Cramer
DOI:10.1002/chem.201504998
日期:2016.2.12
sultams are a valuable compound class in organic and medicinal chemistry. A rapid entry to this structural motif involves a [3+2] annulation of an N‐sulfonyl ketimine and an alkyne. Although the directing‐group properties of the imino group for C−H activation have been exploited, the developments of related asymmetric variants have remained very challenging. The use of rhodium(III) complexes equipped
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.
H8‐BINOL‐Derived Chiral η6‐Benzene Ligands: New Opportunities for the Ruthenium‐Catalyzed Asymmetric C−H Activation
作者:Junxuan Li、Guodong Wang、Weicong Guo、Jijun Jiang、Jun Wang
DOI:10.1002/anie.202405782
日期:2024.7.29
A class of (S)-H8-BINOL-derived chiral η6-benzene ligands has been developed, which can coordinate with ruthenium(II) highly site-selectively.The related chiralruthenium(II) catalysts proved highly effective for the asymmetric C−H activation of N-sulfonyl ketimines with alkynes, affording a series of chiral spirocyclic sultams in up to 99 % yield with up to >99 % ee.
Cp*Co<sup>III</sup>-Catalyzed C–H Alkenylation/Annulation to Afford Spiro Indenyl Benzosultam
作者:Hui Liu、Jie Li、Miao Xiong、Jijun Jiang、Jun Wang
DOI:10.1021/acs.joc.6b00976
日期:2016.7.15
Cp*Co-III-catalyzed tandem inert C-H alkenylation/annulation of N-sulfonyl ketimines with alkynes is revealed. A series of spiro indenyl benzosultams were facilely prepared in good yields under mild reaction conditions.