Radical cyclization of β-(3-indolyl) ketone O-pentafluorobenzoyloximes proceeds by the treatment with a catalytic amount of copper powder in 1,2-dichloroethane to generate 3,4-dihydro-α-carbolines, which are oxidized to α-carbolines with chloranil.
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Tanaka et al. (2005) studied this question.
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