RhIII-catalyzed aryl C–H vinylation for the preparation of styrenes by using vinylacetate, a commercially available and inexpensive compound, as the vinyl source was successfully realized. This method enables various aromatics including N-sulfonyl ketimines, pyridines, azoles, and amides to be vinylated in moderate to good yields.
Palladium‐Catalyzed
<i>ortho</i>
‐Benzoylation of Sulfonamides through C−H Activation: Expedient Synthesis of Cyclic
<i>N</i>
‐Sulfonyl Ketimines
作者:Subhadra Ojha、Niranjan Panda
DOI:10.1002/adsc.201900989
日期:2020.2.6
The ortho‐carbonylation of sulfonylarenes by non‐hazardous aryl aldehydes as a carbonyl precursor was reported. In this method, the sulfonamide group serves as a directing group for C−H activation in the presence of a Pd catalyst under ligand‐free conditions. The scope of this strategy has been extended to the one‐pot two‐step synthesis of cyclic N‐sulfonyl ketimines under mild reaction conditions
The regioselective annulation of alkylidenecyclopropanes by Rh(<scp>iii</scp>)-catalyzed C–H/C–C activation to access spirocyclic benzosultams
作者:Qiuyun Li、Xin Yuan、Bin Li、Baiquan Wang
DOI:10.1039/c9cc09621c
日期:——
Functionalized benzosultams are an essential class of structural motif found in various biologically active molecules. The synthesis of spirocyclic benzosultams from N-sulfonyl ketimine and alkylidenecyclopropanes (ACPs) under the catalysis of Rh(iii) has been developed. This transformation enables the formation of two C-C bonds and a double bond with high E-selectivity through C-H and C-C bond activation
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.