Synlett 2025; 36(11): 1453-1460
DOI: 10.1055/s-0043-1773539
synpacts

Borenium-Catalyzed ‘Chain Walking’

Zheng Zhu
,

The authors acknowledge the start-up funding (Project No. R9804) from the Hong Kong University of Science and Technology (HKUST), the Early Career Scheme from the Research Grants Council of Hong Kong (Project Number: 26307123), the National Science Fund of China (NSFC) Young Scholar Fund (Project Number: 22301254).


Abstract

‘Chain-walking’ chemistry, a catalytic process enabling the functionalization of remote positions in carbon chains, has traditionally relied on transition-metal catalysts to facilitate alkene isomerization and subsequent transformations. This Synpacts article reviews recent advancements in remote hydroboration via chain-walking pathways, highlighting transition-metal-catalyzed strategies for α-, β-, and terminal-selective borylation. Additionally, the isomerization of organoboron compounds and the emerging role of borenium species as transition-metal mimics in hydroboration and isomerization are discussed. In particular, we highlight our recent work on borenium-catalyzed ‘chain walking’ for remote functionalization, where we have unveiled a novel metal-free ‘functionalization-then-isomerization’ strategy.

1 Introduction

2 Background

2.1 Transition-Metal-Catalyzed Remote Hydroboration

2.2 Isomerization of Organoboron Compound

2.3 Borenium-Catalyzed Hydroboration of Internal Alkenes and Isomerization

3 Borenium-Catalyzed ‘Chain Walking’

3.1 ‘Boron-Walking’ Strategy Design

3.2 Reaction Scope

3.3 Synthetic Application

3.4 Mechanistic Study

4 Summary and Outlook



Publikationsverlauf

Eingereicht: 17. Februar 2025

Angenommen nach Revision: 23. März 2025

Artikel online veröffentlicht:
13. Mai 2025

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