A palladium-catalyzed iminoannulation of internal alkynes via direct C-H bond cleavage was developed. Dioxygen was employed as a clean oxidant in this kind of catalysis. Carbolines were synthesized from tert-butylimines of N-substituted indole-2-carboxaldehydes or indole-3-carboxaldehydes.
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Ding et al. (2010) studied this question.
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