Indole derivatives
The influence of dehydrogenating dehydrating (deaminating) additives on the composition and yield on the products of the cyclization of N-(Β-hydroxyethyl)aniline and N,N′-diphenylethylenediamine has been studied. The closure of the indole and pyrrole rings takes place through the dehydration and deamination, respectively, of the starting material on oxide catalysts. A reaction scheme explaining the formation of all the products observed has been suggested.