Palladium-Catalyzed Oxidative Cross-Coupling of N-Tosylhydrazones with Indoles: Synthesis of N-Vinylindoles
摘要:
A general and efficient palladium-catalyzed oxidative cross-coupling reaction of N-tosylhydrazones with indoles providing N-vinylindoles has been developed. The reaction proceeds smoothly with various indoles and N-tosylhydrazones in a stereocontrolled manner, and a wide variety of N-vinylindoles were obtained up to 99% yields for 26 examples.
A General Copper-Catalyzed Coupling of Azoles with Vinyl Bromides
作者:Qian Liao、Yuxing Wang、Liyun Zhang、Chanjuan Xi
DOI:10.1021/jo901105r
日期:2009.8.21
A copper-catalyzed methodology for the coupling of vinylbromides with azoles has been developed. This protocol uses a combination of 10 mol % of copper iodide and 20 mol % of ethylenediamine as catalyst. The reaction proceeds with various azoles and vinylbromides, and the double bond geometry of vinylbromides is retained under the reaction conditions.
A protocol for the synthesis of terminal N-vinylazoles from aromatic aldehydes, DMSO, and azoles has been reported. In this strategy, DMSO was involved in the construction of the C=C bond as a terminal carbon synthon. Both aromatic aldehydes and azoles could be well tolerated and give the corresponding terminal N-vinylazoles in 52–91% yields. Based on preliminary experiments, a plausible mechanism
Au(I)-catalyzed reaction of alkynes with carbazoles that enables a one-step synthesis of vinyl carbazoles that are important molecules for applications as photoluminescent materials. This reaction proceeds under mild conditions at room temperature, without the need of external bases, and can be employed to a variety of aromatic and aliphatic alkynes in monohydroamination and poly-hydroamination reactions. We conclude
The synthesis of N-vinylcarbazoles was achieved by the palladium-catalyzed aza-Wacker reaction of N-H carbazoles with styrenes. In this reaction, Markovnikov adducts were exclusively produced. In contrast, the reaction with electron-deficient alkenes such as acrylates and acrylamides gave only anti-Markovnikov adducts.
Khlebnikov, A.I.; Anfinogenov, V.A.; Moskalev, N.V., Russian Journal of Organic Chemistry, 1993, vol. 29, # 9.2, p. 1573 - 1576