Abstract
A sequential one-pot approach towards 2-(N-substituted amino)-1,4-quinones or 3-indolyl-quinones from naphthol/hydroquinone with amines or indoles, such as various (hetero)aromatic amine and aliphatic amine, has been developed. The reaction proceeds through oxidation of naphthol/hydroquinone with the CuBr2 or (NH4)2S2O8 oxidant. This reaction provides efficient access to the biologically important and synthetically useful 2-amino-quinones and 3-indolyl-quinones with good yields under mild conditions. The present protocol is simple, practical and shows good functional group tolerance.
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