Journal
GREEN CHEMISTRY
Volume 23, Issue 21, Pages 8566-8570Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1gc02908h
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Funding
- Natural Science Foundation of Zhejiang Province [LQ21B020011]
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The study presents a TEMPO-catalyzed electrosynthetic method for the dehydrogenative cyclocondensation of o-aminophenols to access pharmaceutically valuable 2-aminophenoxazinones. The method is mild, sustainable, and does not require stoichiometric oxidants, providing a new approach for the synthesis of bioactive compounds with improved structural diversity. Mechanistic studies show that electrochemically generated TEMPO+ enables the oxidative radical homo-dimerization of o-aminophenols.
The aminophenoxazinone core is widely prevalent in natural products, dyes and pharmaceutical molecules. We report here a TEMPO-catalyzed electrosynthetic method allowing the dehydrogenative cyclocondensation of o-aminophenols. This mild and sustainable method proceeds in the absence of stoichiometric oxidants and uses an easily available organo-electrocatalyst to access pharmaceutically valuable 2-aminophenoxazinones. Mechanistic studies indicate that the electrochemically generated TEMPO+ enables the oxidative radical homo-dimerization of o-aminophenols. The application of electrosynthesis provides an approach for the synthesis of pseudo-aminophenoxazinone alkaloids with improved structural diversification and bioactivities.
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