5 years ago

General Procedures for the Lithiation/Trapping of N-Boc Piperazines

General Procedures for the Lithiation/Trapping of N-Boc Piperazines
James D. Firth, Leigh Ferris, Peter O’Brien
To provide α-substituted piperazines for early stage medicinal chemistry studies, a simple, general synthetic approach is required. Here, we report the development of two general and simple procedures for the racemic lithiation/trapping of N-Boc piperazines. Optimum lithiation times were determined using in situ IR spectroscopy, and the previous complicated and diverse literature procedures were simplified. Subsequent trapping with electrophiles delivered a wide range of α-functionalized N-Boc piperazines. The scope and limitations of the distal N-group were investigated. The selective α- and β- arylation of N-Boc piperazines via lithiation/Negishi coupling is reported.

Publisher URL: http://dx.doi.org/10.1021/acs.joc.7b00913

DOI: 10.1021/acs.joc.7b00913

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