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A unified convenient strategy for the synthesis of 5,6-dihydroxyindole-derived 2,7'-, 2,2'-, and 2,3'-biindolyls is reported, which is based on proper manipulation of key o-ethynylaniline precursors. By the same methodology 5,6-diacetoxy-7-iodoindole can also be obtained in good yield.
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Capelli et al. (2009) studied this question.
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