Recent Advance in Iminyl Radical Triggered C–H and C–C Bond Functionalization of Oxime Esters via 1,5-HAT and β-Carbon Scission

Le Liu; Xin-Hua Duan; Li-Na Guo

doi:10.1055/a-1545-6874

Synthesis, Table of Contents

Synthesis 2021; 53(23): 4375-4388
DOI: 10.1055/a-1545-6874

short review

Recent Advance in Iminyl Radical Triggered C–H and C–C Bond Functionalization of Oxime Esters via 1,5-HAT and β-Carbon Scission

Le Liu

,

Xin-Hua Duan

,

Li-Na Guo∗

Abstract

All articles of this category

Abstract

The direct functionalization of C(sp³)–H and C(sp³)–C(sp³) bonds is considered as one of the most valuable synthetic strategies because of its high efficiency and step-economy for the rapid assembly of complex molecules. However, the relatively high bond disassociation energies (BDEs) and similar chemical environment lead to large obstacles in terms of low reactivity and selectivity. Using a radical-based strategy has proved to be an efficient approach to overcome these difficulties via a hydrogen atom transfer (HAT) process for selective C(sp³)–H functionalization and β-carbon scission for C(sp³)–C(sp³) bond derivatization. Oxime esters have emerged as outstanding precursors of iminyl radicals for versatile chemical transformations. This short review summaries the recent advances in site-specific C(sp³)–H functionalization and C(sp³)–C(sp³) bond cleavage starting from oxime esters by our group and pioneering work by others, mainly focusing on the reaction design as well as the reaction mechanism.

1 Introduction

2 C(sp³)–H Bond Functionalization via 1,5-HAT of Acyclic Oxime Esters

2.1 1,5-HAT/Cyclization

2.2 1,5-HAT/C–C or C–Heteroatom Bond Formation

3 C(sp³)–C(sp³) Bond Functionalization via β-Carbon Scission of Cyclic Oxime Esters

3.1 β-Carbon Scission/C–C or C–Heteroatom Bond Formation

3.2 β-Carbon Scission/Cyclization

4 Conclusion and Outlook

Key words

iminyl radical - oxime esters - 1,5-hydrogen atom transfer - β-carbon scission - C(sp³)–H functionalization - C(sp³)–C(sp³) functionalization

Full Text

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