Hydrogenation of Olefins, Alkynes, Allenes, and Arenes by Borane-Based Frustrated Lewis Pairs

Abstract

In recent years, borane-based frustrated Lewis pairs have proved to be efficient hydrogenation catalysts and they have become an alternative to transition-metal-based systems. The hydrogen activation by classic FLPs leads to a protonated Lewis base and a borohydride. Consequently, hydrogenations catalyzed by classic FLPs consist of stepwise hydride transfer reactions and protonations (or vice versa). More recently, systems that operate via an initial hydroboration have allowed the substrate scope for FLP-catalyzed hydrogenations to be extended. In this review, hydrogenations of organic substrates catalyzed by borane­-based frustrated Lewis pairs are discussed. Emphasis is given to the mechanistic aspects of these catalytic reactions.

1 Introduction

2 FLP-Catalyzed Hydrogenation of Polarized Double Bonds

2.1 Hydrogenation of Michael Acceptors by FLPs

2.2 Asymmetric Hydrogenation of Polarized Double Bonds

2.3 Hydrogenation of Arenes and N-Heterocycles

3 Hydrogenation of Unactivated Olefins and Alkynes

3.1 Hydrogenation of Olefins and Alkynes by an Initial Hydroboration

4 Summary and Outlook

Key words

frustrated Lewis pair - hydrogenation - hydrogen activation - hydroboration - pyridone–borane - metal-free catalysis

Publikationsverlauf

Eingereicht: 14. Oktober 2021

Angenommen nach Revision: 02. November 2021

Accepted Manuscript online:
02. November 2021

Artikel online veröffentlicht:
22. Dezember 2021

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