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
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.