Thieme E-Journals - Synthesis / Abstract
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Synthesis 2017; 49(12): 2589-2604
DOI: 10.1055/s-0036-1589491
review
© Georg Thieme Verlag Stuttgart · New York

Recent Advances in Piperazine Synthesis

Authors

  • Kristen E. Gettys

    Department of Chemistry and Center for Cancer Research, Purdue University,
    West Lafayette, IN 47907,
    USA   
  • Zhishi Ye

    Department of Chemistry and Center for Cancer Research, Purdue University,
    West Lafayette, IN 47907,
    USA   
  • Mingji Dai*

    Department of Chemistry and Center for Cancer Research, Purdue University,
    West Lafayette, IN 47907,
    USA   


Graphical Abstract

Abstract

Piperazine ranks as the third most common N-heterocycle appearing in small-molecule pharmaceuticals. This review highlights recent advances in methods development for the construction of the piperazine­ ring system with particular emphasis on preparing carbon-substituted piperazines.

1 Introduction

2 Reduction of (Di)ketopiperazine

3 N-Alkylation

4 Transition-Metal-Catalyzed/Mediated Piperazine Synthesis

4.1 The SnAP and SLAP Methods

4.2 Palladium-Catalyzed Cyclization

4.3 Gold-Catalyzed Cyclization

4.4 Other Metal-Catalyzed/Mediated Cyclization

4.5 Borrowing Hydrogen Strategy

4.6 Imine Reductive Cyclization

5 Reduction of Pyrazines

6 Miscellaneous

7 Conclusion