A divergent and selective synthesis of ortho- and para-quinones from phenols
摘要:
We describe a divergent synthesis of substituted ortho- and para-quinones by catalytic aerobic oxygenation of phenols. Substituted quinones are omnipresent in chemistry and biology, but their synthesis frequently suffers from low efficiency and poor scope. Our methodology employs a catalytic aerobic di-functionalization of phenols to aryloxy-ortho-quinones. Regioselective substitution with an alcohol provides the alkoxy substituted ortho- or para-quinone, while hydrolysis affords the para-hydroxyquinone. These are mild and selective conditions for the synthesis of diversely substituted quinones from readily available phenol starting materials. (C) 2015 Elsevier Ltd. All rights reserved.
Catalytic aerobic oxidation of phenols to ortho-quinones with air-stable copper precatalysts
作者:M. S. Askari、L. A. Rodríguez-Solano、A. Proppe、B. McAllister、J.-P. Lumb、X. Ottenwaelder
DOI:10.1039/c5dt00822k
日期:——
A range of air-stable copper species was examined for catalytic activity in the catalyticaerobic transformation of phenols into ortho-quinones. Efficient catalysis was obtained with commercially available copper(II) acetate. The stability of all constituents before mixing makes for a practical process that advances previously reported copper(I)-based oxygenations.