Abstract 5,6‐Dihydroxyindole (VIa) and its two mono O ‐methyl analogs (VIb,c), and their 2‐carboxylic acids (XII), tryptamines (XV), and N ‐acetyltryptamines (XVII) have been synthesized. An improved syntheses of the 5,6‐dihydroxyindoles has been developed.
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Benigni et al. (1965) studied this question.
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