Abstract
The cyclization of secondary and tertiary aryl(β-halogenoallyl)amines into 2-methylindoles on heating in orthophosphoric or polyphosphoric acid has been studied. Cyclization of N,N-di(β-bromoallyl)-p-toluidines in polyphosphoric acid forms 1-(β-bromoallyl)-2, 5-dimethyl-indole and 2, 5-dimethylindole. The probable mechanism of the rearrangement in the formation of the indole ring is put forward.
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