Ferric chloride oxidation of 3-hydroxy-4-methoxyphenethylamine (3) and N-(3-hydroxy-4-methoxyphenethyl)-ethylamine (6) afforded the corresponding indole derivatives (10) and (11), respectively, in moderate yield. The synthesis of the indole derivative (13) from N-(3-hydroxybenzyl)dopamine (7) by phenolic oxidative coupling with potassium ferricyanide is also described.
T. Kametani, C. Seino, I. Noguchi, S. Shibuya, K. Fukumoto, T. Kohno and S. Takano, J. Chem. Soc. C, 1971, 1803 DOI: 10.1039/J39710001803
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