ChemInform Abstract: Synthesis of Naphthoquinone Derivatives. Part 13. A Novel Synthesis of Naphthazarin and Juglone Derivatives by Reaction of Naphthazarin and Juglone with Cyclic Enol Ethers.
Abstract
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ChemInform Abstract
A new method to introduce a side chain into the benzene or quinone ring of naphthazarins, juglone as well as naphthols is described. The reaction with cyclic enol ethers such as (II) in the presence of BF3. times.Et2O gives derivatives like (III), (IV), (VI), (VII) and (IX).