Pyrazolopyridine Ligands in Transition-Metal-Catalyzed C–C and C–Heteroatom Bond-Forming Reactions

Eunsu Kang; Jung Min Joo

doi:10.1055/s-0043-1763620

Synthesis, Inhaltsverzeichnis

Synthesis 2024; 56(10): 1549-1562
DOI: 10.1055/s-0043-1763620

short review

Pyrazolopyridine Ligands in Transition-Metal-Catalyzed C–C and C–Heteroatom Bond-Forming Reactions

Eunsu Kang

,

Jung Min Joo ∗

Abstract

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Abstract

Pyrazole-substituted pyridines have emerged as versatile bidentate ligands in transition-metal catalysis, providing opportunities to fine-tune reactivity and selectivity beyond what conventional bipyridine ligands can achieve. This review focuses on two representative pyrazolopyridine ligands: 2-(1H-pyrazol-1-yl)pyridine (1-PzPy) and 2-(1H-pyrazol-3-yl)pyridine (3-PzPy). The 1-PzPy series, characterized by a pyrazole ring serving as a weakly coordinating Lewis basic ligand, offer flexibility in ligand binding. Alternatively, the 3-PzPy series provide both L₂- and LX-type binding modes, functioning as hydrogen bond donors and σ-donors, respectively. The structural diversity of pyrazolopyridine ligands enables the development of various synthetic strategies, facilitating cross-coupling, cycloaddition, photocatalytic, and asymmetric reactions. This review highlights the roles of these ligands in advancing transition-metal-catalyzed C–C and C–heteroatom bond-forming reactions.

1 Introduction

2 Synthesis of Pyrazolopyridine Ligands

3 Applications of 1-PzPy Ligands

4 Applications of 3-PzPy Ligands

5 Conclusion

Key words

ligands - pyrazoles - pyridines - bidentate - C–H activation - palladium - photocatalysis - asymmetric catalysis

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Referenzen

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