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- Title
Synthesis of N-alkyl-N'-aryl or Alkenylpiperazines: A Copper-Catalyzed C-N Cross-Coupling in the Presence of Aryl and Alkenyl Triflates and DABCO.
- Authors
Ghazanfarpour‐Darjani, Majid; Barat‐Seftejani, Forugh; Khalaj, Mehdi; Mousavi‐Safavi, Seyed Mahmoud
- Abstract
Unsymmetrical piperazines are key constituents of many pharmaceuticals. Given that the selective introduction of an aryl and alkyl motif onto the piperazine is not always straightforward, direct arylation and alkenylation of 1,4- diaza-bicyclo[2.2.2]octane would obviate the inefficiencies associated with the preparation of these target molecules. We have utilized alkyl halides, aryl or alkenyl triflates, and 1,4-diaza-bicyclo[2.2.2]octane for the synthesis of N-alkyl- N'-aryl or alkenylpiperazines. The optimum conditions are developed using CuCl, t-BuOLi in NMP. Alkenyl triflates requires N,N'-dimethylethylenediamine and higher temperature to afford the desired cross-coupled product. Substrates bearing electron-deficient and electron-rich groups were successfully coupled under the optimum reaction conditions.
- Subjects
ALKENYLATION; ALKENYL group; FUNCTIONAL groups; HYDROCARBONS; ELECTRON pairs
- Publication
Helvetica Chimica Acta, 2017, Vol 100, Issue 8, p1
- ISSN
0018-019X
- Publication type
Article
- DOI
10.1002/hlca.201700082