Carboamination of alkynes is catalyzed by a Pd0–CuI bimetallic species. The Pd0 species act as a precursor for a π-allylpalladium intermediate while the CuI centers behave as a Lewis acid for CC bonds. This catalyst allows the synthesis of indoles from isocyanates and allyl carbonates (see scheme).
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Kamijo et al. (2002) studied this question.
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