K. Hiroi et al., A novel method for direct construction of indole skeletons by intramolecular carbopalladation of allenes followed by nucleophilic substitution, SYNLETT, (2), 2001, pp. 263-265
Upon treatment with a palladium catalyst, (o-iodoanilinoalkyl)allene compou
nds undergo intramolecular carbopalladation of allenes followed by intramol
ecular amination of pi -allylpalladium complexes to afford indole derivativ
es in fairly good yields.