Tricyclic spirodienones via intramolecular radical phenol–nitronic acid coupling
Abstract
The 1-(ω-nitropropyl)- and 1-(ω-nitrobutyl)-6-hydroxytetralins 10 and 16, obtained by new sequences from 6-methoxytetralone, undergo stereospecific intramolecular coupling between phenolate and nitronate functions, to yield the tricyclospirodienones 11, 70%, and 17, 66%.