Steric effects in the synthesis of indoles from pyridinium salts

In the synthesis of indoles from pyridinium salts the degree of transamination depends on the character of the alkyl group attached to the nitrogen atom of the amine and its nucleophilicity. The yields of indoles decrease as the steric hindrance becomes greater.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 522–524, April, 1985.