Umpolung Strategy for Arene C–H Etherification Leading to Functionalized Chromanes Enabled by I(III) N-Ligated Hypervalent Iodine Reagents

30 July 2021, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

The direct formation of aryl C–O bonds via the intramolecular dehydrogenative coupling of a C–H bond and a pendant alcohol represents a powerful synthetic transformation. Herein, we report a method for intramolecular arene C–H etherification via an umpoled alcohol cyclization mediated by an I(III) N-HVI reagent. This approach provides access to functionalized chromane scaffolds from primary, secondary and tertiary alcohols via a cascade cyclization-iodonium salt formation, the latter providing a versatile functional handle for downstream derivatization. Computational studies support initial formation of an umpoled O-intermediate via I(III) ligand exchange, followed by competitive direct and spirocyclization/1,2-shift pathways.

Keywords

hypervalent iodine
C–H etherification
umpolung
chromane
synthetic methods

Supplementary materials

Title
Description
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Title
Supporting Information: Umpolung Strategy for Arene C–H Etherification Leading to Functionalized Chromanes Enabled by I(III) N-Ligated Hypervalent Iodine Reagents
Description
Synthesis of Reagents, Substrates, General Procedures. Characterization and Spectral Data for Novel Compounds. Supplemental Screening and Mechanistic Studies.
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