Phenolic Oxidation Using H₂O₂ via in Situ Generated para-Quinone Methides for the Preparation of para-Spiroepoxydienones.

ABSTRACT: Phenols are attractive starting materials for the preparation of highly substituted cyclohexane rings via dearomative processes. Herein we report an efficient preparation of dearomatized 1-oxaspiro[2.5]octa-4,7-dien-6-ones (para-spiroepoxydienones) via the nucleophilic epoxidation of in situ generated para-quinone methides from 4-(hydroxymethyl)phenols using aqueous H₂O₂. The developed protocol bypasses the need for stoichiometric bismuth reagents or diazomethane, which are frequently deployed for p-spiroepoxydienone preparation. The p-spiroepoxydienones are further elaborated in numerous downstream complexity-building transformations.

SUBMITTER: McLaughlin MF 

PROVIDER: S-EPMC6717626 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature