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.
Spirocyclic Sultam and Heterobiaryl Synthesis through Rh-Catalyzed Cross-Dehydrogenative Coupling of <i>N</i>-Sulfonyl Ketimines and Thiophenes or Furans
A useful approach is developed for the synthesis of various structurally interesting spirocyclic sultams and heterobiaryls using a cross-dehydrogenative coupling strategy that features high atom and step economy. This method employs [Cp*RhCl2]2 as a catalyst and N-sulfonylimine, a weak coordinating group, as an efficient directing group to assist C–H activation. A number of the coupled products were
Rhodium-catalysed direct C–H allylation of N-sulfonyl ketimines with allyl carbonates
作者:Shu-Tao Mei、Nan-Jin Wang、Qin Ouyang、Ye Wei
DOI:10.1039/c4cc09899d
日期:——
Synthetically useful N-sulfonyl ketimines were efficiently allylated with various allyl carbonates through rhodium catalysis.
合成上有用的N-磺酰基酮亚胺可通过铑催化与各种烯丙基碳酸酯有效地发生烯丙基化反应。
Ein bequemes Eintopfverfahren zur Synthese von 1,2-Benzisothiazol-1,1-dioxiden
作者:D. Hellwinkel、R. Karle
DOI:10.1055/s-1989-27263
日期:——
A Facile One-Pot Procedure for the Synthesis of 1,2-Benzisothiazole 1,1-Dioxides ortho-Lithiated N,N-diphenylbenzenesulfonamides 6 react with aromatic nitriles and N,N-dimethylcarbamonitrile, respectively, to give directly the corresponding 3-substituted 1,2-benzisothiazole-1,1-dioxides 8a-f. Other cyano compounds only transfer the cyano group or its ligands to generate the o-substituted benzenesulfonamides 9a-d.
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