Synlett 2021; 32(08): 752-762
DOI: 10.1055/s-0037-1610760
synpacts

Recent Advances in the Selective Oxidative Dearomatization of Phenols to o-Quinones and o-Quinols with Hypervalent Iodine Reagents

Xiao Xiao
a   The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, P. R. of China
b   Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, PA, 19122, USA
,
Sarah E. Wengryniuk
b   Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, PA, 19122, USA
› Author Affiliations
The authors are grateful to the National Institutes of Health (NIH; R01 GM123098) for financial support of this work.


Abstract

ortho-Quinones are valuable molecular frameworks with diverse applications across biology, materials, organic synthesis, catalysis, and coordination chemistry. Despite their broad utility, their synthesis remains challenging, in particular via the direct oxidation of readily accessible phenols, due to the need to affect regioselective ortho oxidation coupled with the sensitivity of the resulting o-quinone products. The perspective looks at the emergence of I(V) hypervalent iodine reagents as an effective class of oxidants for regioselective o-quinone synthesis. The application of these reagents in regioselective phenol oxidation to both o-quinones and o-quinols will be discussed, including a recent report from our laboratory on the first method for the oxidation of electron-deficient phenols using a novel nitrogen-ligated I(V) reagent. Also included are select examples of total syntheses utilizing this methodology as well as recent advancements in chiral I(V) reagent design for asymmetric phenol dearomatization.

1 Introduction

2 I(V): Hypervalent Iodine Reagents

3 I(V)-Mediated Dearomatization to o-Quinones

4 Bisnitrogen-Ligated I(V) Reagents: ortho Dearomatization of Electron-Poor Phenols

5 I(V)-Mediated Dearomatization to o-Quinols

6 Conclusion and Outlook



Publication History

Received: 30 November 2020

Accepted after revision: 15 December 2020

Article published online:
14 January 2021

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