The First Palladium-Catalyzed Desulfitative Sonogashira-Type Cross-Coupling of (Hetero)aryl Thioethers with Terminal Alkynes
作者:Vaibhav Pravinchandra Mehta、Anuj Sharma、Erik Van der Eycken
DOI:10.1021/ol800054b
日期:2008.3.1
An unprecedented desulfitative Sonogashira-type cross-coupling protocol is exemplified by the synthesis of substituted 5-chloro-3-alkynylpyrazinones from the corresponding 5-chloro-3-(phenylsulfanyl) pyrazin-2(1H)-ones. The applicability of the method is extended to solid-phase linked pyrazin-2(1H)-ones as well as to some oxazinones, pyrazines, and phenyl thioesters.
Mild Room-Temperature Palladium-Catalyzed C3-Arylation of 2(1<i>H</i>)-Pyrazinones via a Desulfitative Kumada-Type Cross-Coupling Reaction
作者:Vaibhav P. Mehta、Sachin G. Modha、Erik Van der Eycken
DOI:10.1021/jo901327y
日期:2009.9.4
An efficient desulfitative Kumada-type cross-coupling protocol is reported for the C3-arylation of 5-chloro-3-(phenylsulfanyl)pyrazin-2(1H)-ones. The method has also been successfully extended to the arylation of some (hetero)aryl thioethers and thioesters.
Palladium-catalyzed copper(i)-mediated cross-coupling of arylboronic acids and 2(1H)-pyrazinones facilitated by microwave irradiation with simultaneous cooling
作者:Brajendra Kumar Singh、Vaibhav Pravinchandra Mehta、Virinder Singh Parmar、Erik Van der Eycken
DOI:10.1039/b704389a
日期:——
The application of a palladium-catalyzed Cu(I)-mediated Liebeskind–Srogl protocol for the decoration of the 2(1H)-pyrazinone scaffold resulted in significantly improved yields and rates when performed under microwave irradiation with simultaneous cooling.
Palladium-Catalyzed Desulfitative CC Cross-Coupling Reaction of (Hetero)Aryl Thioesters and Thioethers with Arylsiloxanes
作者:Vaibhav Pravinchandra Mehta、Anuj Sharma、Erik Van der Eycken
DOI:10.1002/adsc.200800395
日期:2008.10.6
The first desulfitative Hiyama-type cross-coupling protocol is reported and exemplified by the synthesis of substituted 5-chloro-3-arylpyrazinones. The method has also been successfully applied for the arylation of other (hetero)aryl thioethers and thioesters.
A convenient microwave-assisted desulfitative dimethylamination of the 2(1H)-pyrazinone scaffold using N,N-dimethylformamide
作者:Anuj Sharma、Vaibhav Pravinchandra Mehta、Erik Van der Eycken
DOI:10.1016/j.tet.2008.01.030
日期:2008.3
A convenient microwave-assisted methodology is developed for the generation of 5-chloro-3-(dimethylamino)pyrazin-2(1H)-ones. The method entails a chemoselective desulfitative removal of a phenylthioether bond upon DMF/H2O treatment in the presence of sodium carbonate, yielding the desired compounds in 73-96%. (c) 2008 Elsevier Ltd. All rights reserved.