Development of Cycloisomerization with Rearrangement of a Tosyl Group Using N -Tosyl- o -allenylaniline

Sulfonyl indoles were synthesized by migratory cycloisomerization from the allene N -tosyl- o -allenylaniline. 3-Tosyl indoles or 4-tosyl indoles were selectively produced using a Pd catalyst or a Au catalyst, respectively.