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Regioselective electrophilic aromatic substitutions, acylation, bromination, and formylation, of unprotected pyrido[2,3-b]indole (α-carbolines) at the C-6 position are described. Alternative conditions for the nitration were investigated, which led to the unexpected appearance of the minor C-8 isomer.
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Goekjian et al. (2007) studied this question.
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