Synthesis 2021; 53(21): 3909-3934
DOI: 10.1055/a-1519-1670
review

Synthesis and Applications of Cyclopropanones and Their Equivalents as Three-Carbon Building Blocks in Organic Synthesis

Yujin Jang
,
,
This work was supported by North Carolina State University startup funds. Y.J. is grateful to NC State University for a Burroughs Wellcome Fellowship in Organic Chemistry. R.M.R. is grateful to NC State University for Diversity Graduate Assistance grants, and for a Percy Lavon Julian Award in Organic Chemistry.


Dedicated to the memory of Prof. Harry H. Wasserman

Abstract

Cyclopropanone derivatives constitute highly strained cycloalkanones with promising applications as three-carbon building blocks in organic synthesis. Due to the presence of a ketone in such a small ring system, all C–C bonds and the carbonyl group are considered to be labile in suitable conditions, leading to a wide variety of synthetic disconnections, including nucleophilic addition, ring expansion, ring-opening, and (formal) cycloaddition. Despite their synthetic potential, the widespread adoption of cyclopropanones as substrates has been considerably hampered by the difficulties associated with the preparation and storage of such unstable compounds, prompting the development of cyclopropanone surrogates that can equilibrate to the parent ketone in situ via elimination. This review summarizes the syntheses and applications of cyclopropanone derivatives and their equivalents, and offers a perspective of the state of the field as well as its expected future directions.

1 Introduction

2 Preparation of Cyclopropanones and Their Equivalents

2.1 Carbenoid Chemistry

2.2 Allene Oxide Rearrangement

2.3 Ring Closure by Dehydrohalogenation or Dehalogenation

2.4 Photolytic Processes

2.5 Miscellaneous Formation of Cyclopropanones

2.6 Cyclopropanone Equivalents

3 Synthetic Applications of Cyclopropanones and Their Equivalents

3.1 Nucleophilic Addition to the Carbonyl Group

3.2 Ring Expansion

3.3 Ring-Opening

3.4 Cycloaddition and Formal Cycloaddition

4 Conclusion and Outlook



Publication History

Received: 08 May 2021

Accepted after revision: 27 May 2021

Accepted Manuscript online:
27 May 2021

Article published online:
08 July 2021

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