Synthesis 2022; 54(24): 5385-5399
DOI: 10.1055/a-1914-7261
short review

Recent Advances in the Generation of Onium Ylides for Sommelet–Hauser Rearrangements

Eiji Tayama
Our studies were supported by JSPS KAKENHI (Grant Numbers 23750037, 19750029, and 17750034), the Mitsubishi Chemical Corporation Foundation, the Asahi Glass Foundation, the Union Tool Scholarship Foundation, the Foundation for Japanese Chemical Research, and the Uchida Energy Science Promotion Foundation.


Abstract

The Sommelet–Hauser rearrangement of X-benzylic onium ylides (X = heteroatom) is an interesting transformation in organic synthesis. This rearrangement proceeds via dearomative [2,3]-sigmatropic rearrangement, followed by aromatization to form a carbon(sp2)–carbon(sp3) bond. Few advances were made in studies performed around 2000 on this rearrangement because of several competitive side reactions and structural limitations. However, studies performed in the last 15 years on the rearrangement have remarkably expanded the substrate scope and synthetic applications. In this review, the utility of the Sommelet–Hauser rearrangement and recent advances for the generation of onium ylides are described.

1 Introduction

2 Base-Induced Rearrangement

3 Transition-Metal-Catalyzed Rearrangement

4 Light-Mediated Rearrangement

5 Aryne-Induced Rearrangement

6 Conclusions and Outlook



Publikationsverlauf

Eingereicht: 07. Juli 2022

Angenommen nach Revision: 01. August 2022

Accepted Manuscript online:
01. August 2022

Artikel online veröffentlicht:
29. August 2022

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