A1 Journal article – refereed
Acid-Promoted Cascade Cyclization to Produce 2-(4′-Alkoxyaryl)-3,4-Fused Tricyclic Dihydrobenzopyrans via a Vinylidene para-Quinone Methide Intermediate




List of Authors: Dongil Choi, Naoki Shiga, Robert Franzén, Tetsuhiro Nemoto
Publisher: Wiley-VCH Verlag
Publication year: 2018
Journal: European Journal of Organic Chemistry
Journal name in source: European Journal of Organic Chemistry
Volume number: 2018
Issue number: 15

Abstract

We developed a novel method for synthesizing 2‐(4‐hydroxyaryl)‐3,4‐fused tricyclic
dihydrobenzopyrans with 2,3‐syn and 3,4‐syn motif based on the acid‐promoted cascade cyclization via vinylidene para‐quinone methide intermediates. Using easily prepared linear substrates, TFA‐promoted
cascade cyclization proceeded in the presence of triethylsilane, affording a series
of five to seven‐membered ring‐fused dihydrobenzopyran derivatives in moderate to
excellent yield in a highly diastereoselective manner. The developed method provided
new access to potent and selective ERβ agonists.


Last updated on 2019-21-08 at 20:41