A new synthesis of N-aryl- and N-heteroaryl-N'-(arylalkl)pipeazines using palladium-catalyzed amination of aryl bromicies and heteroaryl chlorides with mono N-benzyl- or N-(arylethyl)piperazines is reported. Most coupling processes proceed in high yield and good selectivity using either diadmantyl-n-butylphosphine (1), 2-(dicyclohexylphosphino)-2'-(N,N-dimethylamino)biphenyl (2), or 2-((di-tert-butylphosphino)biphenyl (3) as ligand. Applying an automated parallel synthesizer the preparation of a small library of potentially bioactive compounds is easily achieved. (C) 2004 Published by Elsevier Ltd.
Iodine-Mediated One-Pot Synthesis of 2-(Piperazin-1-yl)pyrazine Derivatives from N-Alkyl Piperazines
作者:Kangping Xu、Guishan Tan、Ruihuan Liu、Yikun Wang、Yanmei Weng、Caiping Yao、Yan Zhang、Gangzhi Zhu、Xiaoai He
DOI:10.1055/s-0036-1588701
日期:——
An iodine-mediated one-pot reaction of N-alkyl piperazines is described for the first time. This transformation provides a straightforward and facile pathway to the synthesis of 2-(piperazin-1-yl)pyrazine derivatives with the corresponding N-alkyl piperazines as single material. Based on a series of control experiments, a plausible reaction mechanism has been proposed.