Cationic rhodium(I)-complexes generated from [RhCl(PPh3)3] and AgSbF6 catalyse at room temperature the first examples of intramolecular [4+2] cycloaddition reactions with N-tethered ynamides and provide an efficient access to synthetically versatile tetrahydroindoles.
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Witulski et al. (2003) studied this question.