A unified strategy for the synthesis of highly oxygenated diaryl ethers featured in ellagitannins.

Abstract:

:Ellagitannins are a family of polyphenols containing more than 1,000 natural products. Nearly 40% of these compounds contain a highly oxygenated diaryl ether that is one of the most critical elements to their structural diversity. Here, we report a unified strategy for the synthesis of highly oxygenated diaryl ethers featured in ellagitannins. The strategy involves oxa-Michael addition of phenols to an orthoquinone building block, with subsequent elimination and reductive aromatization. The design of the building block--a halogenated orthoquinone monoketal of gallal--reduces the usual instability of orthoquinone and controls addition/elimination. Reductive aromatization is achieved with perfect chemoselectivity in the presence of other reducible functional groups. This strategy enables the synthesis of different diaryl ethers. The first total synthesis of a natural ellagitannin bearing a diaryl ethers is performed to demonstrate that the strategy increases the number of synthetically available ellagitannins.

journal_name

Nat Commun

journal_title

Nature communications

authors

Hirokane T,Hirata Y,Ishimoto T,Nishii K,Yamada H

doi

10.1038/ncomms4478

subject

Has Abstract

pub_date

2014-03-24 00:00:00

pages

3478

issn

2041-1723

pii

ncomms4478

journal_volume

5

pub_type

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