The reactivity of N-tosylindole (4) in the presence of aluminum chloride was studied, and two types of oligomerization of 4 were observed. One type was condensation between both pyrrole parts (dimers 5 and 6 and trimer 7) and the other was between a pyrrole part and a benzene part of each indole nucleus (dimers 8 and 9).
The reactivity of «V-methoxycarbonyl indole 2 in the presence of aluminum chloride was studied and the structures of the products were determined to be dimers 3a-c, 4a-c, 5 and 6.
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